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The Best Water Softener Air Gap of 2023 – Reviewed and Top Rated

2,177 Reviews Scanned

Rank No. #1

Dual Air Gap for Water Softener and Reverse Osmosis with 1-1/2 inch and 3/8 or 1/4-inch inlets, 1-1/2 or 2-inch Standpipe (8500, GAP-CAP, AG130-001)

♥ EASY TO CONNECT: Gap-Cap air gap (AG130-001) has 1/2-inch OD inlet port for 1/2-inch PVC pipe connection. The 1/2-inch inlet accommodates any 1/2-inch slip joint adapters including a threaded end, barb connection, and a quick connect for PEX tubing. The same inlet accommodates 5/8-inch OD tubing that can be directly inserted into the inlet. A 3/8-inch inlet port is provided for RO systems. This port can accommodate both 3/8-inch poly-tubing and 1/4-inch poly-tubing with included adapter.
♥ STANDPIPE CONNECTION: Gap-Cap air gap (AG130-001) inserts directly into the 1-1/2-inch and 2-inch standpipes. The body of the air gap provides stops to ensure secure placement. This air gap can be used with plastic or metal standpipes. If needed, it can be glued in place with plastic standpipes using regular PVC adhesive. The air gap outlet is designed to pass up to 7 gallons per minute. The optimum recommended flow rate is 4-5 gallons per minute.
♥ SPLASH PROTECTION: The AG130-001 air gap uses splash guards to assure a completely dry operation. Splash guards are an integral part of the design and can be seen through the side air gap window. During water softener operation, an initial discharge surge can create splashing. Splash shield eliminates the possibility of water splashing outside of the air gap. When designing drainage for an air gap, makes sure that P-trap is located minimum 20-inches from the top of the standpipe.
♥ QUIET OPERATION: When water exits the air gap, depending on the design, it may flow directly into a P-trap. This can create splashing noise that may be objectionable. To avoid excessive noise, it is recommended to use 22 degrees elbow inline with standpipe to avoid direct drainage to P-trap. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback.
♥ CERTIFICATION: The AG130-001 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code) and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. Also, all of the products are tested for strength and to make sure that every glue joint will withstand at least 40lb of force and not break. The testing is conducted for every manufactured lot to ensure consistent performance.

SaleRank No. #2

Plumb Pak PP855-69 2 in. Plastic Water Softener Air Gap for Standpipes

BACKFLOW PROTECTION: Provides full backflow and anti-siphon protection to prevent wastewater from getting into water supply
EASY TO INSTALL: Fits 1-1/2-in. and 2-in. diameter metal or plastic standpipes, can be mounted at 3 different levels
STANDARD DESIGN: Allows soft rubber washer hose or aluminum washer drain hook up to share standpipe with other air gap units, recommended usage 1 to 7 gallons/minute (3. 7 to 26. 5 liters/minute)
VARIOUS APPLICATIONS: For use with washing machine discharge, dehumidifiers, water filtration devices, and water softeners
COMPLIANCE: UPC listed and tested for compliance to IPC and NSF standards, provides more than twice the code-required minimum air gap opening

Rank No. #3

Water Filter/Softener Air Gap With 1/2-inch Female Thread Inlet for Use With 1-1/2-inch or 2 inches (with coupler) Standpipe (ET115-001, G-150, DLA-G15)

❤ FLOW RATE: The ET115-001’s minimum flow rate is 0.5 gallons per minute (GPM) and the maximum flow rate is 7 gallons per minute (GPM). The minimum and maximum flow rates through an air gap are the lowest and highest flow rates at which water does not splash outside of an air gap. At minimum or maximum flow rate, the air gap is dry on the outside.
❤ SIMPLE INSTALLATION: The ET115-001 is designed for connecting discharge water tubing from a water discharge equipment to a drain line. Its 1/2-inch MIPT threaded inlet accepts a 1/2-inch threaded PVC pipe or the 1/2-inch threaded ET170-XXX series air gap adapters (models -001 to -008 and -017). The ET115-001 installs to a 1-1/2 inches OD standpipe or 2 inches OD standpipe with 2-inch couplers. The ET115-001 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET115-001 connects to a 1-1/2 inches OD standpipe or 2 inches OD standpipe with couplers. The air gap’s flow capacity is 15 gallons/minute.
❤ DRY OPERATION: The ET115-001 is designed with a splash guard to assure a dry operation. It is also recommended to install the ET115-001 at least 18 inches above the P-Trap to avoid water splashing back from the air gap.
❤ CERTIFICATION: The ET115-001 is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code), and NSF (National Sanitation Foundation) tested. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #4

Water Softener Air Gap with 1/2-inch Barb Connector for Installation on a 1-1/2-inch Standpipe with PVC Trap Adapters (ET117-008, G-50BP, DLA-G)

❤ SIMPLE INSTALLATION: The ET117-008 is designed for connecting discharge water tubing from a water softener to a drain line. Its 1/2-inch barb inlet accommodates a 1/2-inch ID poly tube, while its 1-1/2-inch OD outlet connects to a 1-1/2-inch standpipe drain. Included PVC adapters provide for a secure connection to the standpipe. A black vinyl end cap (P/N ET170-018) is offered as an optional accessory for the ET117-008. The ET117-008 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET117-008 has a 1-1/2-inch OD outlet that connects to a 1-1/2-inch standpipe. The air gap can adapt to different pipe materials and sizes with the use of additional adapters or couplers. The air gap’s flow capacity is 15 gallons/minute.
❤ DRY OPERATION: The ET117-008 is designed with a splash guard to assure a completely dry operation.
❤ CERTIFICATION: The ET117-008 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code), and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #5

Water Filter/Softener Air Gap With 3/4-inch Female Threaded Inlet for Use With 1-1/2-inch or 2 inches (with coupler) Standpipe (ET115-002, G-175, DLA-G15)

❤ FLOW RATE: The ET115-002’s minimum flow rate is 0.5 gallons per minute (GPM) and the maximum flow rate is 9 gallons per minute (GPM). The minimum and maximum flow rates through an air gap are the lowest and highest flow rates at which water does not splash outside of an air gap. At minimum or maximum flow rate, the air gap is dry on the outside.
❤ SIMPLE INSTALLATION: The ET115-002 is designed for connecting discharge water tubing from a water softener system to a drain line. Its 3/4-inch MIPT threaded inlet accepts a 3/4-inch threaded PVC pipe or the 3/4-inch threaded ET170-XXX series air gap adapters (models -009 to -014). The ET115-002 installs to a 1-1/2 inches OD standpipe or 2 inches OD standpipe with 2-inch couplers. The ET115-002 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET115-002 connects to a 1-1/2 inches OD standpipe or 2 inches OD standpipe with couplers. The air gap’s flow capacity is 15 gallons/minute.
❤ DRY OPERATION: The ET115-002 is designed with a splash guard to assure a dry operation. It is also recommended to install the ET115-002 at least 18 inches above the P-Trap to avoid water splashing back from the air gap.
❤ CERTIFICATION: The ET115-002 is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code), and NSF (National Sanitation Foundation) tested. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #6

Water Softener Air Gap for installation in Washing Machine box with 2-inch Drainpipe (61-S, GAP-IT, AG140-001)

♥ EASY TO CONNECT: The AG140-001 air gap has 1/2-inch OD inlet port that is designed to fit 1/2-inch schedule 40 PVC slip fitting with O-ring. It is designed to fit into recessed washing machine outlet boxes with 2 inches drainpipe. The AG140-001 allows space for washer drain hook or soft rubber washer hose.
♥ STANDPIPE CONNECTION: The AG140-001 comes with a 2 inches PVC mounting base that fits into a recessed washing machine box with 2 inches drainpipe. The air gap is tested at 15 gallons per minute and recommended usage is 7 gallons per minute.
♥ SPLASH PROTECTION: The AG140-001 air gap uses splash guards to assure a completely dry operation. Splash guards are an integral part of the design and can be seen through the side air gap window. During water softener operation, an initial discharge surge can create splashing. Splash shield eliminates the possibility of water splashing outside of the air gap. When designing drainage for an air gap, makes sure that P-trap is located minimum 20-inches from the top of the standpipe.
♥ QUIET OPERATION: When water exits the air gap, depending on the design, it may flow directly into a P-trap. This can create splashing noise that may be objectionable. The AG140-001 air gap is designed with a flow straightener to quiet and smooth out turbulent flow. Also, to avoid excessive noise, it is recommended to use 22 degrees elbow inline with standpipe to avoid direct drainage to P-trap. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback.
♥ CERTIFICATION: The AG140-001 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code) and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. Also, all of the products are tested for strength and to make sure that every glue joint will withstand at least 40lb of force and not break. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #7

Universal Air Gap for Water Softeners and Filters with 1/2-inch OD or 5/8-inch ID Inlet Port and 1-1/2-inch or 2-inch Drainpipe Outlet (AG100-001, MR. DRAIN, 34700)

❤ FLOW RATE: MR. DRAIN air gap’s maximum flow rate is 12.5 gallons per minute (GPM). The maximum flow rate through an air gap is the highest flow rate at which water does not splash outside of an air gap. At maximum flow rate, the air gap is dry on the outside.
❤ EASY TO CONNECT: MR. DRAIN air gap (AG100-001) has 1/2-inch OD inlet port for direct 1/2-inch PVC pipe connection. The 1/2-inch inlet accommodates any 1/2-inch slip joint adapters. The adapters include a threaded end, barb connection, and a quick connect for PEX tubing. Also, the inlet accommodates 5/8-inch OD tubing that can be directly inserted into the inlet. For tubing to stay in place, it needs to be attached to a support structure within 12-18 inches from the inlet port.
❤ STANDPIPE CONNECTION: MR. DRAIN air gap (AG100-001) inserts directly into the 1-1/2-inch and 2-inch standpipes. The body of the air gap provides stops to assure secure placement. This air gap can be used with plastic or metal standpipes. If needed, it can be glued in place with plastic standpipes using regular PVC adhesive. The air gap outlet is designed to pass up to 15 gallons per minute. The optimum recommended flow rate is 7 gallons per minute.
❤ SPLASH PROTECTION: The AG100-001 air gap uses splash guards to assure a completely dry operation. Splash guards are an integral part of the design and can be seen through the side air gap window. During water softener operation, an initial discharge surge can create splashing. Splash shield eliminates the possibility of water splashing outside of the air gap. When designing drainage for an air gap, makes sure that P-trap is located minimum 20-inches from the top of the standpipe.
❤ QUIET OPERATION: When water exits the air gap, depending on the design, it may flow directly into a P-trap. This can create splashing noise that may be objectionable. To avoid excessive noise, it is recommended to use 22 degrees elbow inline with standpipe to avoid direct drainage to P-trap. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback. If an elbow is not an option for your application, we can provide a flow deflector.

Rank No. #8

Water Softener/Filter Air/Condensate Air Gap With 1-inch Threaded Inlet for Use With 2-inches Standpipe (ET120-001, G-200, DLA-G20)

❤ FLOW RATE: The ET120-001’s minimum flow rate is 6 gallons per minute (GPM) and the maximum flow rate is 22 gallons per minute (GPM). The minimum and maximum flow rates through an air gap are the lowest and highest flow rates at which water does not splash outside of an air gap. At minimum or maximum flow rate, the air gap is dry on the outside.
❤ SIMPLE INSTALLATION: The ET120-001 is designed for connecting discharge water tubing from a water softener system to a drain line. Its 1-inch MIPT threaded inlet accepts a 1-inch threaded PVC pipe or the 1-inch threaded ET170-XXX series air gap adapters (models -015 and -016). The ET120-001 installs to a 2 inches OD standpipe. The ET120-001 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET120-001 connects to a 2 inches OD standpipe. The air gap’s flow capacity is 15 gallons/minute.
❤ DRY OPERATION: The ET120-001 is designed with a splash guard to assure a dry operation. It is also recommended to install the ET120-001 at least 18 inches above the P-Trap to avoid water splashing back from the air gap.
❤ CERTIFICATION: The ET120-001 is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code), and NSF (National Sanitation Foundation) tested. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #9

Universal Multi-Drain Air Gap for Condensates, Water Softeners and Water Filters with 1/2-inch and 3/4-inch PVC and Copper Pipe Adapters (AG180-002, GAP-A-DRAIN)

❤ EASY TO CONNECT: The AG180-002 air gap comes with pipe support adapters for 1/2-inch or 3/4-inch PVC and copper pipe connection. Snap-in retainer provides a simple way to secure 1/2-inch pipes. For larger pipes, use a pipe support adapter and a stainless-steel worm clamp. For pipes to stay in place, ensure they are secured to a support structure within 12-24 inches from the air gap. An air gap is a non-pressurized device, and therefore very little pressure is exerted on the pipes.
❤ STANDPIPE / DRAIN CONNECTION: The AG180-002 installs directly onto a 2-inch standpipe or connects securely to a floor drain using a stainless hook. This air gap can be used with plastic or metal standpipes. If needed, it can be glued in place to a plastic standpipe using regular PVC adhesive. The air gap is designed to drain up to 36 gallons per minute safely. The optimum recommended flow rate is 18 gallons per minute.
❤ SPLASH PROTECTION: The AG180-002 uses a funnel design to assure a splash-free operation. During water softener operation, an initial discharge surge can create splashing. Funnel design and side splash guards eliminate the possibility of water splashing outside of the air gap. Make sure that P-trap is located minimum 12-inches from the top of the standpipe. This is needed to avoid water splashback from the P-trap and to create static water pressure for continuous water drainage.
❤ DRAINAGE CONTROL: When water exits the air gap, depending on the drainpipe design, it may flow directly into a P-trap. In some cases, this can create splashing noise that may be objectionable. To avoid excessive noise, it is recommended to use 22 degrees elbow inline with standpipe to avoid direct drainage into P-trap, but instead, let water flow on the side of the standpipe. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback.
❤ UNIVERSAL AIR GAP: The AG180-002 is a universal air gap that can accommodate flow rates below 36 GPM. The AG18-002 tested for strength and to make sure that every joint and connection will withstand at least 40lb of force and not break. The AG180-002 can accommodate up to 5 different discharge pipes and can handle the simultaneous flow from a water softener, RO filter, condensate, and iron filter. All discharge pipes should be pointed to the center of the air gap to provide the best drainage.

Rank No. #10

Ecotech (G-50BP) 1 1/2" X 5/8" Jaco Softener Airgap Kit

Rank No. #11

Water Softener Air Gap for installation in Washing Machine box with 1-1/2-inch Drainpipe (GAP-IT, AG140-002)

♥ EASY TO CONNECT: The AG140-002 is a water softener air gap that is designed to share the drainpipe with a washing machine discharge tubing. It has a 1/2-inch OD inlet port that is designed to fit 1/2-inch schedule 40 PVC slip fitting with O-ring, and a 3/4-inch OD outlet. To ensure secure mounting on vertical wall or to back of outlet boxes, a wall bracket and four Phillips Pan Head Screws are provided. The AG140-002 allows space for washer drain hook or soft rubber or plastic washer hose.
♥ STANDPIPE CONNECTION: The AG140-002 comes with a 4-inch long, 7/8-inch ID flexible rubber hose that fits onto the air gap’s 3/4-inch OD outlet. It is designed to fit into recessed washing machine outlet boxes with 1-1/2-inches or 2 inches standpipe. The air gap is tested at 15 gallons per minute and recommended usage is 7 gallons per minute.
♥ SPLASH PROTECTION: The AG140-002 air gap uses splash guards to assure a completely dry operation. Splash guards are an integral part of the design and can be seen through the side air gap window. During water softener operation, an initial discharge surge can create splashing. Splash shield eliminates the possibility of water splashing outside of the air gap. When designing drainage for an air gap, makes sure that P-trap is located minimum 20-inches from the top of the standpipe.
♥ QUIET OPERATION: When water exits the air gap, depending on the design, it may flow directly into a P-trap. This can create splashing noise that may be objectionable. The AG140-002 air gap is designed with a flow straightener to quiet and smooth out turbulent flow. Also, to avoid excessive noise, it is recommended to use 22 degrees elbow inline with standpipe to avoid direct drainage to P-trap. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback.
♥ CERTIFICATION: The AG140-002 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code) and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. Also, all of the products are tested for strength and to make sure that every glue joint will withstand at least 40lb of force and not break. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #12

Water Softener Air Gap with 5/8-inch JACO Compression for Installation on a 1-1/2-inch Standpipe with ABS Trap Adapters (ET117-005, G-58JA, DLA-G)

❤ SIMPLE INSTALLATION: The ET117-005 is designed for connecting discharge water tubing from a water softener to a drain line. Its 5/8-inch JACO compression inlet accommodates a 5/8-inch OD poly tube, while its 1-1/2-inch OD outlet connects to a 1-1/2-inch standpipe drain. Included ABS adapters provide for a secure connection to the standpipe. The ET117-005 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET117-005 has a 1-1/2-inch OD outlet that connects to a 1-1/2-inch standpipe. The air gap can adapt to different pipe materials and sizes with the use of additional adapters or couplers. The air gap’s flow capacity is 15 gallons/minute.
❤ DRY OPERATION: The ET117-005 is designed with a splash guard to assure a completely dry operation.
❤ CERTIFICATION: The ET117-005 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code), and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #13

Eco-Tech G-175 DLA-G15 Multipurpose Stand-Pipe Airgap, (Hub x Fipt) for all Schedule-40 DWV Stand-Pipes Reverse Osmosis 'RO' Water Softener Appliances

Rank No. #14

Universal Dual Air Gap with Dual 3/8-inch OD Ports (AG100-002, 34800)

❤ FLOW RATE: The AG100-002’s maximum flow rate is 4 gallons per minute (GPM) for each port. The maximum flow rate through an air gap is the highest flow rate at which water does not splash outside of an air gap. At maximum flow rate, the air gap is dry on the outside.
❤ EASY TO CONNECT: The AG100-002 air gap has two 3/8-inch OD inlet port for direct 3/8-inch ID poly tube connection. Both inlets can drain water simultaneously without interfering with each other. Since an air gap is a non-pressurized device, very little pressure is exerted on the tubing connected to the air gap. To minimize the movement of tubes connected to the air gap, it is recommended that tubes are secured to a supporting structure using clamps within 18 inches from the air gap.
❤ STANDPIPE CONNECTION: The AG100-002 air gap inserts directly into the 1-1/2-inch and 2-inch standpipes. The body of the air gap provides stops to assure secure placement. This air gap can be used with plastic or metal standpipes. If needed, it can be glued in place to plastic standpipes using regular PVC adhesive. The air gap outlet is designed to pass up to 8 gallons per minute. The optimum recommended flow rate is 5 gallons per minute.
❤ SPLASH PROTECTION: The AG100-002 air gap uses splash guards to assure a completely dry operation. Splash guards are an integral part of the design and can be seen through the side air gap window. During water softener operation, an initial discharge surge can create splashing. Splash shield eliminates the possibility of water splashing outside of the air gap. When designing drainage for an air gap, makes sure that P-trap is located minimum 20-inches from the top of the standpipe.
❤ QUIET OPERATION: When water exits the air gap, depending on the design, it may flow directly into a P-trap. This can create splashing noise that may be objectionable. To avoid excessive noise, it is recommended to use 22 degrees elbow inline with standpipe to avoid direct drainage to P-trap. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback. If an elbow is not an option for your application, we can provide a flow deflector.

Rank No. #15

IPW Industries Inc- ET117-008, G-50BP, DLA-G - Air-Gap 1-1/2-inch Standpipe with PVC Trap Adapters for Water Softeners/Backwashing Filter Systems with 1/2-inch Barb Connector

Connects softener and RO drains to all material Schedule-40 standpipes
Uses standard plumbing fittings to meet code requirements nationwide
Comes in kit form with instructions and fittings needed for installation

Rank No. #16

Multipurpose Air Gap with 1/2-inch Quick Connect for Installation on a 1-1/2-inch Standpipe with PVC Trap Adapters (ET117-004, G-50QCP, DLA-G)

❤ SIMPLE INSTALLATION: The ET117-004 is designed for connecting discharge water tubing from any water discharge equipment to a drain line. Its 1/2-inch quick connect inlet accommodates a 1/2-inch OD poly tube, while its 1-1/2-inch OD outlet connects to a 1-1/2-inch standpipe drain. Included PVC adapters provide for a secure connection to the standpipe. The ET117-004 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET117-004 has a 1-1/2-inch OD outlet that connects to a 1-1/2-inch standpipe. The air gap can adapt to different pipe materials and sizes with the use of additional adapters or couplers. The air gap’s flow capacity is 15 gallons/minute.
❤ DRY OPERATION: The ET117-004 is designed with a splash guard to assure a complete dry operation.
❤ CERTIFICATION: The ET117-004 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code), and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #17

High Flow Rate Inline air gap with 1/4-inch FIP or 1/2-inch Thread Inlet and 5/8-inch Compression Fitting or 3/-inch Thread Outlet. (AG150-002, 211212, GAP-A-FLO)

❤ EASY TO CONNECT: Gap-A-Flo High Flow air gap (AG150-002) has a 1/4-inch FIP or 1/2-inch MIP threaded inlet and 1-1/4 inches outlet. The inlet accommodates 1/4-inch FIP or 1/2-inch threaded PVC adapters, while the outlet can accommodate 3/4-inch threaded PVC adapters. The AG150-002 provides a convenient way to install the air gap which can tilt up to 45 degrees.
❤ STANDPIPE CONNECTION: Gap-A-Flo High Flow air gap (AG150-002) is a gravity flow device and must have an outlet poly tubing feeding directly to a drain without kinks or bends. It can be oriented in any way between 45 degrees and vertical with inlet port elevated above the outlet port. To ensure easy wall mounting, a Jiffy Clip clamp is included with the air gap. The AG150-002 air gap’s recommended flow rate is 12 gallons per minute.
❤ SPLASH PROTECTION: The AG150-002 air gap uses rotating splash guards to assure a completely dry operation. Splash guards are an integral part of the design and can be seen through the side air gap window. During water softener operation, an initial discharge surge can create splashing. Splash shield eliminates the possibility of water splashing outside of the air gap. When designing drainage for an air gap, makes sure that P-trap is located minimum 20-inches from the top of the standpipe.
❤ QUIET OPERATION: When water exits the air gap, depending on the design, it may flow directly into a P-trap. This can create splashing noise that may be objectionable. To avoid excessive noise, it is recommended to use 22 degrees elbow in line with standpipe to avoid direct drainage to P-trap. The pipe elbow should be located at least 12 inches from the air gap to eliminate splashback.
❤ CERTIFICATION: The AG150-002 is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code) and NSF (National Sanitation Foundation) tested. The testing is conducted for every manufactured lot to ensure consistent performance.

Rank No. #18

Reverse Osmosis Filter Air Gap (Inlet and Outlet fits 3/8-in OD poly tubing and 5/8-in ID poly tubing; AG110-001, KIT S-A, GAP-A-RO)

❤ FLOW RATE: The GAP-A-RO air gap’s maximum flow rate is 1 gallon per minute (GPM). The maximum flow rate through an air gap is the flow rate at which water does not splash outside an air gap. The air gap is dry on the outside at the maximum flow rate.
❤ EASY TO CONNECT: The AG110-001 air gap’s inlet and outlet ports accommodate 3/8-in OD poly tubing and 5/8-in ID poly tubing. The inlet connects to 3/8-in OD poly tubing from the R.O. unit, while the outlet connects to 3/8-in OD poly tubing, which directly feeds to a standpipe. Both inlet and outlet support a 5/8-in ID poly tubing as the air gap’s design enables the larger tube to be used either for the inlet or outlet, to be part of a double-sealed system, or to protect the inside tubing.
❤ STANDPIPE CONNECTION: The AG110-001 air gap’s outlet connects to a 3/8-inch OD poly tubing which feeds directly to a standpipe without kinks or bends. Accessories such as a mounting bracket, clamps, and screws are provided with the air gap to secure its connection to the standpipe.
❤ CERTIFICATION: The AG110-001 is listed by UPC and in compliance with IPC and NSF standards. Also, all the products are tested for strength to ensure that every glue joint will withstand at least 40lb of force and not break. The testing is conducted for every manufactured lot to ensure consistent performance.
❤ COMPATIBILITY: Our reverse osmosis air gaps such as the AG110-004 are not compatible with reverse osmosis faucets with air gap.

Rank No. #19

Multipurpose Air Gap with 3/8-inch Quick Connect for Installation on a 1-1/2-inch Standpipe with PVC Trap Adapters (ET117-002, G-38QCP, DLA-G)

❤ SIMPLE INSTALLATION: The ET117-002 is designed for connecting discharge water tubing from any water discharge equipment to a drain line. Its 3/8-inch push-in quick connect inlet accommodates a 3/8-inch OD poly tube, while its 1-1/2-inch OD outlet connects to a 1-1/2-inch standpipe drain. Included PVC adapters provide for a secure connection to the standpipe. The ET117-002 can be pressure fit or glued to a plastic standpipe.
❤ STANDPIPE CONNECTION: The ET117-002 has a 1-1/2-inch OD outlet that connects to a 1-1/2-inch standpipe. The air gap can adapt to different pipe materials and sizes with the use of additional adapters or couplers. The air gap’s flow capacity is 15 gallons/minute.
❤ QUIET OPERATION: The ET117-002 is designed with a splash guard to assure a complete dry operation. A drip noise prevention membrane (P/N ET170-019) is offered as an optional accessory to stop dripping sound caused by dripping water from the ET117-002 air gap.
❤ CERTIFICATION: The ET117-002 is legal to install in any state. It is UPC (Uniform Plumbing Code) Listed, IPC (International Plumbing Code) and NSF (National Sanitation Foundation) tested. These certifications assure that every product is safe to use. The testing is conducted for every manufactured lot to ensure consistent performance.
❤ COMPATIBILITY: Our reverse osmosis air gaps such as the ET117-002 are not compatible with reverse osmosis faucets with air gap.

Rank No. #20

Metpure RO Faucet Reverse Osmosis Drinking Water Air Gap Filtration System Water Dispenser Spout (Brushed Nickel) with Pre-Inserted Tubing and Faucet Wrench RO-FW148

👍 PREMIUM QUALITY: This vase style ceramic disc lever reverse osmosis airgap faucet is crafted with solid brass exterior for durability and lasting finish. The product passes lead-free material requirement and its solid weight and smoothness can be appreciated throughout.
👍EASY INSTALL: The airgap RO faucet comes with pre-installed tubings and quick connect couplings that will allow you to effortlessly hook it up to your existing water filtration system.
👍 COMPATIBLE FIT: RO systems requiring a 1/4” brine input and 3/8” brine output airgap hook up lines are compatible with this faucet. With the quick connect couplings that come with the package, installing this airgap RO faucet to your system is a breeze. If you are looking to replace an existing airgap RO faucet with 1/4” and 3/8” drain lines, this one will guarantee to replace and fit.
👍 CONVENIENT USAGE: The tall gooseneck of this RO faucet swivels 360 degrees for all dispensing angles and the built-in ceramic disc valve will provide a smooth operation on every dispense.
👍 FREE INSTALL TOOL: We know how difficult it is to get under your sink and install faucets so we made things super easy for you- the included FREE RO faucet wrench eases installation time by more than half and ensures tight mount.

Last update on 2023-08-05 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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FAQ:

Q: What is a floor drain air gap?

A: An air gap is the most simple and effective means of preventing contamination of a potable water supply. Once potable water leaves the outlet of a fixture, it’s either used or sent down the drain.

Q: What is the air gap in a washing machine?

A: The purpose of an air gap is to prevent contaminated water from being pulled back into the water supply system. This would be nearly impossible with a clothes washer due to it’s design. The air gap is the point in between where the water enters the fixture and where the water exits the fixture.

Q: What is an air gap in a kitchen sink?

A: An air gap is the unobstructed space between a wall outlet and an open vessel or flood level of a fixture. An example of an air gap is the space between a faucet and the sink rim. This gap prevents the reverse flow of contaminated water from the sink back into the faucet without some modification of the system.

Q: What is an air gap valve?

A: The simplest, most reliable way to provide backflow prevention is to provide an air gap. An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool. A simple air gap has no moving parts, other than flowing water.