Best 10 Compression Union Fittings in 2026

INSTALLS IN SECONDS: Repair with no special tools, soldering, crimping, or glue; Just push to create a quick watertight union with SharkBite pushfit connectors

VERSATILE: SharkBite plumbing fittings fit copper, CPVC, and PEX pipe and connect all 3 types in any combination

LEAD-FREE: Made of high-quality forged DZR brass that is lead-free. Ball valves, shutoffs, and compression fittings, are safe for potable water lines

Half union for connecting and disconnecting two tubes more easily than with a coupling

45-degree flare head tube connection on one side and a male NPT connection on the other

Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability

Type: Compression Union

Tube Size:3/8" OD

Materies: BRASS

Hex bushing for connecting two pipes with different diameters

1/4" Male NPT threads on one end and 1/8" female NPT threads on the other for connecting pipes with different ends

Legines pipe fittings are made of CA360 or CA377 brass, not ordinary copper alloy, and meet SAE standard, have dryseal threads, forgings & extruded.

High quality brass for leak-proof reliability

Our brake line unions are made with unmatched superior quality

Made of durable brass which is resistant to corrosion from salt that can be used on roads in the winter

Type:Push In Male Connector. Size:1/4” od tubing 1/4”NPT. Weight:18.5g od tubing air fitting quick release air line fittings

Fluid Admitted:Air, Vacuum, air fittings (No Freezing)

Working Pressure:0-1.0mpa | 0-150psi. Proof Pressure:1.5.Mpa | 150 psi push fittings tube coupler airline quick connect

★ 【Material】: Heavy Duty Brass,strong and durable. Size: 1/4" Tube OD x 1/4" inch NPT Male Adapter.

★ 【Firm And Durable】: Litorange Brass for corrosion resistance, high temperature ductility and low magnetic permeability.

★ 【Function】: Fitting connects to tubing on one end and has an NPT male connector on the other. Use with copper, brass, aluminum, or plastic tubing.

Made of high-quality plastics and brass for durable use

Type: Quick Connect Fitting Connector

Advantages: Easy installation and disassembly, good sealing performance

1/4"x1/4" Brass Pipe Hose Fitting with NPT Female Thread Straight Hex Nipple Fast Coupler

Good raw material brass, high corrosion resistance, low magnetic characteristics and high temperature ductility

Made with precision process, no leaking and durable, easy to connect and disconnect

【Size】1/2 male to 3/8 male reducer compression fitting is used for connecting two threaded pipes in different diameters. The 3/8 end link to 0.52 inch diameter female; the 1/2 end link to 0.75 inch diameter female.

【Premium Material】The RV faucet adapter is made of solid brass and treated with nickel coating. More sturdy, durable, anti-corrosion, and rust-proof when used.

【Widely Application】Our faucet adapters mainly apply to connect pipes, especially for RV, camper, kitchen, and bathroom faucet hose, widely used in your life. Solve the trouble of inappropriate pipe size in daily life.

【SIZE & NPT THREADS TYPE】: Size: 3/8" NPT x 3/8" NPT Male Threads, OD: 0.65 Inch, ID: 0.44 Inch, Length: 1.18 inch; Note: This hex nipple are NPT threads type, not compression threads, Compression and NPT are two different thread types, Please check if the size fits your needs before your purchase.

【FIRM】: Brass for corrosion resistance, hightemperature ductility and low magneticpermeability, solid brass can withstand up to 100 °C(212 °F); Note: Brass fittings are notallowed by federal law to be installed for potablewater use in the U.S.A. and its territories

【DURABLE】: SUNGATOR selects high quality solidbrass with a longer service life, firm and durable, thishex nipple is not a cast product, meets specifications ASTM B584 and ASME/ANSI B16 for quality assurance

✅ SPECIFICATION - Standard brass pipe fitting 3/8" NPT female to 3/8" NPT female coupling adapter for connecting two male threaded pipes with the same diameter in a straight run.

✅ MATERIAL - This pipe coupler is made of high quality durable brass for corrosion resistance, high temperature ductility and low magnetic permeability. Can be used in wet environments; it can also be used with grease, fuels and natural gas, refrigeration, instrumentation and hydraulic systems in low and medium pressure pipe line connections.

✅ EASY INSTALLATION - The deep threads design makes fittings bite better, engaged with the object to enhance fixation, no leaking, not easy to slip. Easier and faster installation.

【Metal Adapter】Our pipe fitting solid brass constructed, strong and wear resistant more durable than iron and iron galvanized pipe fittings. 3PCS- adapter 1/2 inch NPT Male Pipe to 1/2 inch Female Pipe.

【Durable and Steady】Heavy duty brass pipe fitting construction has excellent performance in terms of corrosion resistance, high temperature ductility and low magnetic permeability, solid brass can withstand up to 100 °C (212 °F)

【Widely Application】Adapter for connecting pipes or fittings of different thread types, brass is corrosion resistant and can be used in wet environments. Deeper and smoother threads design makes work easier and more efficient, Easy to use and connected.

Size - 1/4" - 1/8", 3/8" - 1/8" , 3/8" - 1/4", 1/2" - 1/4", 1/2" - 3/8", 3/4" - 1/2"

Material - Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability

Temperature range - Operating temperatures range from -53 to 121 degrees C (-65 to 250 degrees F)

1/4 Union Straight Push to connect fittings Fluid Admitted: Air, Water, Steam ;Pressure: 2MPa | 290psi/ Applicable: Pipe PU/NYLON/Soft PE; Working Temperature:-20°C—120°C | -4°F—248°F

1/4 Push connectors Nickel Plated Brass - corrosion resistance, ductility at high temperatures, and low magnetic permeability; Seal: O-ring FKM(Viton)

These 1/4 quick connect fittings work great ,available in various styles and models ,good to suit your pneumatic piping needs perfectly, easy to connect and disconnect, a quick fix to your leaking problems.

Three piece construction - nut, sleeve and body with attached insert Use with copper, brass, aluminum, or plastic tubing

High Pressure Resistance,Temperature Resistance

Sealability and good repeatability,Easy to disassemble no flaring tool required

✔Tee Union Adapter: 3/8” male and female compression fittings x 1/4" tube quick connect, and two 1/2" NPT converter fittings.

✔Two Extra Converter Fittings: Fitting A : 1/2" male NPT and 3/8" female NPT threaded connections; Fitting B: 3/8" male NPT and1/2" female NPT threaded connections.Allows to connect both 1/2" and 3/8" water supply.

✔Rough Brass Constructions: Full copper material to prevent leakage, strong and long lasting life time

Material: Brass For Corrosion Resistance, Ductility At High Temperatures, And Low Magnetic Permeability

Widely Used: Widely Used In The Fuel/Air/Lquid/Oil/Gas/Vacuum Lines

Features: Good Airtightness, Pressure Resistance, Not Easy To Trip,NPT thread size does not actual diameter, it is only nominal pipe size.

Compression union

Brass material lasts long

Not for use in potable drinking water applications

【Package Includes】: 10 PCS 3/8" Compression x 3/8" Compression Union with A Sealing Tape.

【Lead Free Brass】: Heath and environment friendly material. Made of Lead Free Brass. Lead free brass is for both potable and non-potable water.

【Superior Material】: The 100% heavy duty brass tube fitting is firmer than iron and iron galvanized products, more robust and durable than castings.

SIZE - 5/16" Tube OD x 5/16" Tube OD, Compression Tube Fitting mainly consists of a fitting body with a 24 degree tapered hole, a ferrule with a sharp inner edge, and a nut for compression.

MATERIAL - Made of high-quality brass, with strong wear and corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility.

Use - Suitable for oil, gas, water and other non-corrosive or corrosive pipeline systems, temperature and pressure resistance, good sealing and repeatability, no need for welding and flaring tools, easy disassembly, installation and maintenance, etc.

5/16" Brass compression unions - Pack of 3

These compression unions are used on fuel, transmission, oil, return power steering line and coolant lines

Works with steel, copper, aluminum & nylon tubing material or combinations of these together

Type: Standard 3/8" Tube OD (Compression) male to 3/8" Tube OD (Compression) male.Compression nuts and ferrules included.5pcs

Reducing adapter for different size tube pipes or fittings,Both fitting connects to tubing end.

Tube OD Compression Straight Coupling Adapter for converting Aluminum, Plastic, and Copper straight compression thread pipe Tubing.

UNION COMPRESSION FITTING: Made of brass, has tube connections & suitable for indoor air application. Brass sleeves feature a compression-type connection

THREADED CONNECTION that can be screwed to connect tubes more easily than with a coupling. Can help eliminate the need to flare, solder, or prepare tubing before assembly

MADE OF BRASS for corrosion resistance, ductility at high temperatures & low magnetic permeability. Use with annealed copper, aluminum, and thermoplastic tubing

👉【PREMIUM MATERIAL】: Our dot air brake fitting assortment is made of high quality CA360 brass, meets D.O.T FMVSS 571.106 and Air Brake System Requirements. With corrosion resistance, high temperature ductility and low permeability. Long service use, dot air brake fitting type: 1/8" 1/4", 3/8", 1/2", 5/8" .

👉【EASY TO INSTALL】: Our dot air line kit quicks disconnect simply push tubing in, need to use tools to fix loose parts to handle in tight places, so that use will be more firm and not easy to fall off. And pieces that contain a threaded end already have sealant pre applied to provide a secure connection.

👉【TYPICAL APPLICATION】: Air brake fittings assortment kit can be used with air systems, copper tubing in air lines brake systems, which is perfect for automotive car or truck repair,air operated seats, operating gauges, air horns, industrial workshops, air brake connections,towing machine hose connection and air brake connections or lawn mower repair.

Size: 3/8 inch OD copper tube connector is suitable for rigid pipes such as copper and aluminum pipes and is suitable for rigid pipes with a 3/8 inch OD; not suitable for hoses

Package Contents: there are 4 pieces copper tube connectors, the quantity is sufficient to meet your home usage and replacement needs, you can also share them with your neighbors or relatives

Tear and Wear Resistant: made of quality brass material, these line pressure fittings are reliable and sturdy, will not easy to break, tear and wear resistant, which can serve you for a long time

【PREMIUM MATERIAL】：Our DOT air brake fittings are made of high quality CA360 brass,Meets D.O.T FMVSS 571.106 , Air Brake system Requirements,with corrosion resistance, high temperature ductility and low permeability. Great for long time use, dot air brake fitting type: 1/4", 3/8", 1/2"，1/8", 5/8" .

【 AIR LINE NYLON TUBING KIT】:The air brake fittings contain 44 PCS. 12PCS DOT Union , 6PCS DOT Tee , 4PCS Bushing, 8PCS 90⁰ DOT Male Elbow Connector, 8PCS DOT Straight Male Connector , 4PCS 45⁰ DOT Male Elbow Connector , 2pcs Compression Fittings 1/4" tube x 1/4" NPT Male. Fitting types: 1/4", 3/8", 1/2",1/8",5/8". All in a durable yet lightweight plastic storage container with flip lock tabs, rust and secure.

【EASY TO INSTALL】: Our dot air fitting kit quicks disconnect simply push tubing in, need to use tools to fix loose parts to handle in tight places, so that use will be more firm and not easy to fall off.And pieces that contain a threaded end already have sealant pre applied to provide a secure connection.

Reducer Adapter: Premium solid brass with thicker wall, more durable than iron and iron galvanized pipe fittings, 1/4" NPT male pipe x 3/8" NPT female pipe

Reducing Hex Nipple: Reducing hex nipple for connecting two threaded pipes with different diameters. Male National Pipe Taper (NPT) threads for connecting to female threaded pipes

Hex Bushing: Has a 3/8” male NPT threaded on one end and a 1/4” female NPT threaded on the other for connecting a female and a male pipe or fitting with different diameters

Made of brass material and conform to DIN 2353, ISO 8434-1, and DIN EN 3851 standards. Extensively used in high working pressure and temperature applications.

Consists of a fitting body, nut and sleeve. The sleeve provides extra sealing capability.

Ensure an excellent and reliable sealing in high-pressure applications with strong mechanical grip design. Easy to use, fewer leak paths, dampen vibrations, ease of use and installation, and high durability.

Material & Construction:High quality Aluminum and Brass and nitrile.Nickel plated brass fitting guards against corrosion.

Installation: Easy to install,no flaring tool required.Double O-ring compression style fitting,the tubing also can be removed if needed.

Temperature Range:-40℉ to 140℉,Ratings ASTM F1282 and ASTM F1974.