The Best 3/8 Coupler of 2023 – Reviewed and Top Rated

2,614 Reviews Scanned

Rank No. #1

Sanpaint 2 Pack 3/8" x 3/8" NPT Coupler, Brass Female Pipe Fitting

Coupling for connecting two pipes with the same diameter in a straight run
Female National Pipe Taper (NPT) threads for connecting to male threaded pipes
Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability
Operating temperatures range from -53 to 121 degrees C (-65 to 250 degrees F)
Please note :Pipe Size ≠Thread O.D（NPT Thread Size is a nominal pipe size and it does not representhe actual diameter）

Rank No. #2

transkoot 2pcs 3/8" to 3/8" NPT Male Thread Brass Straight Hex Nipple Fast Coupler Pipe Hose Fitting 3/8 inch x 3/8 inch Straight Fitting

3/8" Male thread and male thread with 90 degree for connecting pipe; hard connect way so it does not need sealing for most situation;
Meet NPT requirement of US, better than NPT thread, could be used as NPT thread, too;
Good raw material brass, high corrosion resistance, low magnetic characteristics and high temperature ductility;
Meet ASTM B584 and ASME/ANSI B16, some parts have DOT certification;
Direct manufacturer sales so bulk orders are acceptable with good price and short lead time;

Rank No. #3

Legines Brass 3/8" NPT Female × 3/8" NPT Female Coupling Coupler Hex Head Pipe Fitting 1200psi (2pcs)

Coupling for connecting two pipes with the same diameter in a straight run
3/8" Female National Pipe Taper (NPT) threads for connecting to 3/8" male threaded pipes.
Legines pipe fittings are made of CA360 or CA377 brass, not ordinary copper alloy, and meet SAE standard, have dryseal threads, forgings & extruded.
Operating pressure of our fittings is up to 1200psi, more higher than other general fittings. Temperatures range from -53 to 121 degrees C (-65 to 250 degrees F)
These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.

Rank No. #4

Uenede 4PCS Brass Hex Nipple Coupling 3/8" NPT Female Threaded Equal Diameter Coupler Air Hose Pipe Fittings Adapter for Water/Oil/Gas

【Package Include】4PCS 3/8"NPT Female thread pipe fittings.
【Solid Brass】The hex pipe fittings are made of solid brass, which is strong and not easily corroded, suitable for long time use.
【Heavy & Thick】Premium forged brass connector, thicker and stronger, durable, threads are deep and accurate, high corrosion resistance, low magnetic permeability and high temperature ductility.
【Hex Design】Hex for easy tightening and loosening. Easy to use.
【Solid Connection】Coupling for connecting two pipes with the same diameter in a straight run, or Extending the pipe length. Apply to plumbing connections, compressed air, hydraulic, gas and other applications.

Rank No. #5

Hooshing 2PCS Brass 3/8" NPT Female x 3/8" NPT Female Coupling Coupler Hex Brass Pipe Fitting Adapter

CONNECTION - 3/8" x 3/8" female NPT threads equal diameter hex nipple for connecting two female threaded pipes with same diameters.
PREMIUM MATERIAL - Made of solid brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability. Strong and durable, long service life.
CLEAN THREADS - High quality smooth and deep threads allow the fittings to bite better, tight threads, not easy to slip.
FEATURES - Operating temperatures range from -53 to 121℃ (-65 to 250 ℉). Woking Pressure: 150PSI.
MULTI-FUNCTION - This female pipe coupling is a great tool for both DIYers and professional plumbers! It can apply to water, oil and fuel, and be used to connect various pipes as well as air tools; it can also be used with grease, fuels, LP and natural gas, refrigeration, instrumentation and hydraulic systems in low and medium pressure pipe line connections.

SaleRank No. #6

Milton Industries (S-766) 3/8" FNPT Female V-Style High-Flow Coupler

Milton s-766 HI-Flo V-Style 'A,M,V' 3/8" FNPT Brass Body
Milton is your number 1 source for Quality Air Accessories
Since 1943 Milton has been producing Quality Air Accessories
Milton covers automotive, industrial, hardware, agriculture, heavy-duty fleet and MRO markets

Rank No. #7

ANPTGHT Brass Pipe Fitting NPT Coupler, 3/8" x 3/8" Standard NPT Female thread (pack of 2)

Coupling for connecting two pipes with the same diameter in a straight run
3/8" x 3/8" Standard NPT Female thread
It is made of high-quality brass forging, has a sealed thread, is easy to plug and unplug, and does not leak water. Brass itself has high corrosion resistance, low magnetic properties and high temperature ductility
The maximum working pressure is 1200psi, and the suitable working temperature is -53 to 121 degrees C (-65 to 250 degrees F)
For use with LP and natural gas, refrigeration, and hydraulic applications

SaleRank No. #8

Climax Metals RC-037 Black Oxide Plated Mild Steel Rigid Coupling, 3/8" Bore, 3/4" Outside Diameter, 1" Length, 1/4"-20 x 3/16" Set Screw

Provides torque transmision and alignment
Cost effective coupling design
Easily installed where major disassembly would otherwise be required
Tolerance: +.0005/+.0025
Black oxide provides some corrosion resistance

Rank No. #9

JOROY 3/8 High Flow Air Fittings, Industrial M-Type Coupler, 3/8 Inch Flow Size, 3/8 Inch Female Threads Size, Steel Material, 300PSI, 10 Pieces Air Compressor Accessories Fittings

3/8 High Flow Body Size: 3/8 Inch body size air fittings provide up to 70% more air flow than 1/4 Inch body air fittings, 1/4 Inch body air fittings provide 35 SCFM at 100PSI working pressure.
3/8 Inch Female Threads Size: This coupler is used to connect components to an air compressor stuff. Please confirm the threads size before buying.
Durable: There is six locking balls in the coupler which hold the plug securely, sleeve guard is designed to reduce the potential of accidental disconnects for consistent performance.
Material: Heat-Treated steel air coupler which features durability and long life. Zine-plated operation features higher corrosion.
Common Use: This coupler is industrial M-type, which can be connected with other brands’ plug with same type and body size. Seal Tape is needed when using.

Rank No. #10

Bueyfolt Coupling Nuts, 3/8"-16 x 1-3/4", Zinc-Plated Steel Rod Coupling Nuts 3/8 in.-16 TPI, 25-Pack

Size: 3/8-16 inch diameter, 1-3/4" inch length coupling nut zinc-plated steel.
Premium Material: Rod Coupling Nuts is made of high quality zinc plated steel to ensure long term use.
Application:The rod coupling nut is great for both indoor and outdoor use. Suitable for communication, office equipment, electronics and other industries.
Easy to Install: The rod coupling nut needs to be tightened with a wrench so that the two parts of fasteners or fittings are joined together.
Product Included: 25 packs coupling nut; Hex-Shaped on the outsides, a wrench can tighten or loosen it easily.

Rank No. #11

Metaland Brass 3/8" Hose Barb Splicer Mender Euqal Barbed Coupler Round Union Adapter (Pack of 2)

√【Material】Made of solid brass, high quality, can work in high temperatures and pressure.
√【Size】3/8" Hose Barb, suitable for 3/8" ID hoses or tubings.
√【Quantity】Package including 2PCS barbed fittings and 4PCS hose clamps.
√【Connetion】Hose Barb on both ends that can connect with two hoses or tubings in same inner diameter. Barbed retracting locks for easy slide-back connecting and disconnecting.
√【Working Temperature&Pressure】Temperature range from -200 to +500 degrees F, Maximum working pressure of 300 psi.

Rank No. #12

Pysrych Forged 304 Stainless Steel Pipe Fitting Reducer Coupling 3/8" NPT Female x 1/4" NPT Female Adapter Reducing Coupler 1pc

Reducing coupling pipe fitting for extending and connecting pipes of different sizes.
Fitting connects to 3/8" Female on one end and has 1/4" Female connector on the other.
Made from stainless steel 304 for corrosion resistance, forged for durability.
Use in high pressure applications. Max Pressure: 16MPa/2320psi; Working Temperature Range: -50℃~+200℃/-58℉~+392℉
Not include lead, can be used for potable water.

Rank No. #13

CX WONDERLAND 2PCS Brass Hose Barb Fitting Metals Splicer Mender, 3/8" Barb Hose Union Fuel Gas Water Air Euqal Barbed Coupler Round Union Adapter

FUNCTION: This brass hose barb fitting metals splicer mender is an adapter for connecting two hoses or tubings in the same inner diameter. The application of our barb splicer is very wide, such as temperature control circuits, pneumatic circuits, vacuum and fluid systems test apparatus, lubricant, and coolant lines. It can apply to water, gas, oil, and fuel
HIGH-QUALITY MATERIAL: As a solid and sturdy material, brass is perfect for hose systems as it can withstand long periods of wear and tear. It is corrosion-resistant and can be used in wet environments. Brass is also more durable than iron and iron galvanized pipe fittings.
THREAD: Barbed edges allow the fittings to bite better and not slip easily. The excellent connection, more profound, and smoother threads design make work easier and more effective.
OPERATING TEMPERATURES: Solid brass can withstand up to 100 ℃ (212℉）.
WARNING: This product can expose you to chemicals including lead, which is not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.

Rank No. #14

3/8" NPT ISO7241-B Hydraulic Quick Connect & Disconnect Coupler, Quick Release Coupling Set w/Dust Caps, Kubota 7J417-66220|7J417-66320 Replacement Hydraulic Quick Coupler H3-63/62

1.→Multiple Choices:There Have Many Hydraulic Quick Coupling Supply Which Include :The 1/2"|1/4"|3/4"|3/8" LX-S2-ISO 7241-B Series Hydraulic Quick Connect Couplers.Please Select On the Size Name Option
2.→Model:1 Set:3/8" Body,3/8" NPT Thread Hydraulic Quick Disconnect Coupling,Set Includes 2 Dust Caps
3.→Materials And Structure :Machined From Solid Steel Barstock For Durability.
The LX-S2 Series Quickly Couplers Critical parts are hardened for durability.Dependable ball-locking mechanism holds the mating halves together.
4.→Technology:Poppet valves available to prevent uncoupled leakage.Poppet valves open automatically when coupled, within rated working pressure, to keep the flow expeditely.Dependable ball-locking mechanism holds the mating halves together.LX-S2 series conforms to the standard of ISO 7241-B.Test Fluid:Oil-200SUS.1GPM=3.78L/Min,1PSID=0.0069MPa
5.→Interchangeable With：Compatible With Parker 60 Series:H3-63, H3-62|Safeway S10 Series:S101-3, S105-3|Faster HNV:HNV 38 NPT M, HNV 38 NPT F|Snap-Tite 72 Series:72N6-6F, 72C6-6F |Stucchi IRB Series:M IRB38 NPT / 800601005, F IRB38 NPT / 800601004| Dixon H-Series:H3F3, 3HF3|Eaton HK Series:3K21, 3H21|DNP HNV Series:HNV-06-06-N-NPT, HNV-06-06-C-NPT

Rank No. #15

Brass Coupler Reducer, ZESE 2PCS Brass Pipe Fitting 3/8" NPT Female × 3/8" NPT Female Thread Hex Nipple Adapter

【Size】: Standard brass 3/8" NPT female thread × 3/8" NPT female thread fitting connector for connecting 3/8" NPT male thread fittings together.
【High Quality Material】: Made of high quality solid brass with high durability, its sturdiness and corrosion resistance, better than iron or galvanized pipe fittings. With high temperature ductility and low magnetic permeability.
【Performance and Function】：Operation temperature range from -53 to 121°C (-65 to 250°F), Operation pressure up to 1200 PSI, used for grease, fuels and natural gas in low and medium pressure line connections, refrigeration, instrumentation and hydraulic systems, and air tools.
【High-Quality Thread】: NPT standard thread can enhance the fixation of the pipe joint, and the deeper and smoother thread makes your installation work easier and more effective.
【Note】: NPT thread size is the nominal pipe size and does not represent the actual diameter,please choose the appropriate size for yourself before purchasing.

Rank No. #16

3/8″ NPT ISO 7241-B Brass Quick Disconnect Hydraulic Coupler Set …

Size: 3/8″ Body, 3/8″ NPT Thread, Poppet Valve
Body Material: Brass material for corrosion resistance
3,000 PSI Rating, Nominal Flow Rate: 6.08 GPM, Max Flow Rate: 12.15 GPM
Spring Material: 304 Stainless Steel, Locking Ball Material: 316 Stainless Steel
Seal Material: Viton FKM, Temperature Range: -15°F to +400°F

Rank No. #17

JOROY Air Coupler with 3/8 Hose Barb, Industrial M-Type, 1/4 Inch Body Size, Brass Material, 10 Pieces Air Compressor Hose Fittings

1/4 Inch Body Size: 1/4 Inch Body air hose fittings provides 35 SCFM at 100PSI working pressure, which meet the needs of the most air compressor stuff or accessories.
3/8 Inch Hose Barb: his coupler can be used directly to connect to the hose with 3/8 Inch inner diameter. Please confirm the inner diameter of hose before buying.
Material: Heat-Treated brass air coupler which features high corrosion resistance and a longer using life. Sleeve guard is designed to reduce the potential of accidental disconnects for consistent performance.
Common Use: This coupler is industrial M-Type, which can be connected with other brands’ plug with same type and body size.
10PCS 1/4 industrial M-type coupler with 3/8 inch hose barb, 300PSI of Max working pressure. Brass material.

Rank No. #18

SUNGATOR Brass Pipe Fittings, 3/8" NPT x 3/8" NPT Male Pipe Hex Nipple Adapter, 3/8'' NPT Equal Hex Nipple Connector, Brass Pipe Fittings for Oil, Natural Gas, Air Lines, Refrigeration (2-Pack)

【SIZE CHECK & NPT THREADS TYPE】: 3/8" NPT x 3/8" NPT Male Threads Size. ATTENTION: These hex nipples are NPT tapered threads type, not compression threads! Compression Threads ≠ NPT Threads, they are two different thread types. Please check if the size fits your needs before purchase.
【SOLID BRASS】: SUNGATOR 3/8'' hex nipples is firm and durable with longer service life as these plumbing pipe fittings are made of solid brass not cast products. Brass construction for high corrosion resistance, temperature ductility and low magnetic permeability, they can withstand up to 100 °C(212 °F) and 300 PSI.
【PRECISE THREADS】: Deeper threads design allows these brass pipe fittings to be better engaged with the object to enhance fixation, and the smoother threads make installation easier and faster. Note: Brass fittings are not allowed by federal law to be installed for potablewater use in the U.S.A. and its territories
【VERSATILE APPLICATION】: SUNGATOR hex nipple adapters for connecting two female threaded pipes or fittings with same size, it can also served as pipe extension connector. Widely used in gas, oil, fuels, grease, LP, natural gas, refrigeration, instrumentation and hydraulic systems in low and medium pressure pipe line connections
【PACKAGE INCLUDE】: 3/8" NPT x 3/8" NPT Male hex nipple adapter × 2. These equal hex nipple connectors meet specifications ASTM B584 and ASME/ANSI B16.

Rank No. #19

WYNNsky Industrial Air Coupler and Plug Kit, 3/8 Inch High Flow Body Size, 1/4 Inch NPT Threads Size, Steel Material, 9 Pieces Air Compressor Hose Accessories Fittings

3/8 High Flow Body Size: 3/8 Inch body size air fittings provide up to 70% more air flow than 1/4 Inch body air fittings, 1/4 Inch body air fittings provide 35 SCFM at 100PSI working pressure.
Air Fittings Standard: There is six locking balls in the coupler which hold the plug securely, sleeve guard is designed to reduce the potential of accidental disconnects for consistent performance. 300PSI of Max Working Pressure.
Application: This 3/8 Inch body size with 1/4 Inch NPT threads size air coupler and plug is used to connect components to an air compressor. 1/4 Inch NPT threads size compatible with most air tools and air hose. These fittings can be used with other brands’ fittings with same type and body size. Seal tap is needed.
Material: Heat-treated steel air plug which features higher corrosion resistance and longer life. Zine-Plated steel coupler for added durability and reliability.
This 9 Pieces air fittings kit including 1pc 1/4 Inch MNPT coupler, 2pcs 1/4 Inch FNPT coupler, 4pcs 1/4 Inch MNPT plug, 2 pcs 1/4 Inch FNPT plug. WYNNsky is committed to providing outstanding value, top customer service and long-lasting, high-quality products to our customer.

Rank No. #20

JOROY 3/8 Air Compressor Hose Fittings, Automotive T-Type, 3/8 Inch NPT Male Threads Size, Steel Material, 10 Pieces Air Coupler Set

3/8 High Flow Body Size: 3/8 Inch body size air fittings provide up to 70% more air flow than 1/4 Inch body air fittings, 1/4 Inch body air fittings provide 35 SCFM at 100PSI working
3/8 Inch MNPT Threads Size: This coupler is used to connect components to an air compressor stuff. Please confirm the threads size before buying.
Material: Heat-Treated steel air coupler which features durability and long life. Zine-plated operation features higher corrosion.
Durable: There is six locking balls in the coupler which hold the plug securely, sleeve guard is designed to reduce the potential of accidental disconnects for consistent performance.
Common Use: This coupler is Automotive T-type, which can be connected with other brands’ coupler with same type and body size. Seal Tape is needed when using.

Last update on 2024-02-23 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 3/8 Coupler.
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The Best 3/8 Coupler of 2023 – Reviewed and Top Rated

How Do You Buy The Best 3/8 Coupler?

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