Best Union Car Brake Fittings in 2026

Fit for: the unions measures approx. 0.6 x 0.9 inch, the nut measures approx. 0.67 x 3/8 inch, fit for most common inverted flare or double flare sizes for 3/16 inch tube, for use with 3/16 inch steel, poly coated or copper brake lines; Please confirm the size of the details according to the picture before purchasing

Size and material: both the unions and nuts are metric 3/8-24 threads (regular 3/16 inch tube fitting size), all brake line fittings are made of quality brass to prevent rust and plated for corrosion resistance

You will get: 12 pieces brake line fittings in the package, include 4 pieces unions and 8 pieces nuts, you can share them with your family and friends, these tubes unions are good fittings

Inverted flare

Metric 10x1 fittings and unions

Pack of 6

PACKAGE INCLUDE - MuHize upgraded Brake Fittings Replacement (Pack of 15): ① 5 x 3/8-24 threads unions; ② 10 x 3/8-24 threads nuts. Note：Both the unions and nuts is 3/8-24 threads (regular 3/16 inch tube fitting size) . Please check before shopping!

INVERTED FLARE UNION- Any 2 (3/16 inch) brake lines can be easy to joined with Muhize unions. both the sizes for unions and nuts are both 3/8-24 threads, which is the regular brake fitting size for 3/16 inch tube.

HIGHER QUALITY - MuHize brake fittings are made of durable brass with unique rust corrosion proofing technology.

These preflared stainless steel lines are perfect for the DYI or hot rod person. These lines are not vehicle specific, make sure to check your tubing size and fitting sizes.

These lines are grade 304 Stainless Steel and come with inverted double preflared ends along with 3/8"-24 standard 3/16" plated steel fittings & two 3/8"-24 female unions

Pack of 3, each piece is 32" long

Available in many different styles, including elbows, union, and tees

A large variety of tube diameters and pipe sizes available

Conveniently packaged in diverse piece counts to assist with both small and large projects

Auto Supplies Direct (70) Piece 3/16″ & 1/4″ Brake Line Fittings Kit (3/16″ and 1/4″ Tube Nuts, Unions, and Compression Fittings) for Cars and Trucks

Contains a (30) Piece 3/16″ Inverted Flare Brake Line Fittings Assortment, which Includes: (10) 3/16″ Short Tube Nuts, (10) 3/16″ Long Tube Nuts, and (10) 3/16″ Unions

Contains a (30) Piece 1/4″ Inverted Flare Brake Line Fittings Assortment, which Includes: (10) 1/4″ Short Tube Nuts, (10) 1/4″ Long Tube Nuts, and (10) 1/4″ Unions

Contain common air brake fitting styles

D.O.T Union:1/4"(4 pcs), 3/8"(4 pcs), 1/2"(4 pcs), 5/8"(2 pcs)

D.O.T Tee:1/4"(2 pcs), 3/8"(2 pcs), 1/2"(2 pcs); Bushing: 3/8" NPT Female x 1/2" NPT Male(2 pcs)

Available in many different styles, including elbows, union, and tees

A large variety of tube diameters and pipe sizes available

Conveniently packaged in diverse piece counts to assist with both small and large projects

3/16" Tube (3/8-24 Thread, Inverted Flare) Brake Line Union Pack of 5 for Cars and Trucks

Convenient Pack of 5 - With a total of 5 pieces in each pack, you'll have enough unions for multiple connections or to keep extras on hand for future repairs.

Durable and Reliable - Made with professional quality brass, these unions are designed to last and provide a tight, leak-free seal for years to come.

【PREMIUM MATERIAL】：Our push in fittings are made of high quality CA360 brass,Certified by DOT and Air Brake system Requirements,with corrosion resistance, high temperature ductility and low permeability. Great for long time use, dot air brake fitting pneumatic fittings type: 1/4"

【TYPICAL APPLICATION】：The 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, heater controls, industrial workshops, daily garden or lawn mower repair, towing machine hose connection and air brake connections .

【EASY TO BE INSTALLED】: Union connect two tube with same OD. All quick connect fittings can be sealed by pushing the tube firmly into the fittings and they are also simple to be removed from the tube.

Auto Supplies Direct 1/4" Brake Line Unions Pack of 5 7/16' - 24 Thread, Inverted Flare for Cars and Trucks

For Automotive Brake Line Systems, Works With Your Preferred 1/4" Brake Line Of Your Choice

Most Common 1/4" SAE Inverted Flare / Double Flare Size

【PREMIUM MATERIAL】：Our push in fittings are made of high quality CA360 brass,Certified by DOT and Air Brake system Requirements,with corrosion resistance, high temperature ductility and low permeability. Great for long time use, dot air brake fitting pneumatic fittings type: 3/8" .

【TYPICAL APPLICATION】：The 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, heater controls, industrial workshops, daily garden or lawn mower repair, towing machine hose connection and air brake connections .

【EASY TO BE INSTALLED】: Union connect two tube with same OD. All quick connect fittings can be sealed by pushing the tube firmly into the fittings and they are also simple to be removed from the tube.

👉【Premium Material】: Our air line fittings are made of PBT Plastic, the air brake brass fittings DOT approved are made of high quality CA360 brass, with corrosion resistance, high temperature ductility and low permeability. Great for long time use.

👉【Quantity】: Unique dot air line quick connect fittings nylon tubing kit: The plastic tube fittings contain 28 pieces: 8 pcs Male straight push connectors, 6 pcs Straight tube unions. 6 pcs 90 degree Elbows. 4 pcs 90 degree Elbows NPT thread. 4 pcs Tube tees. The brass tube fittings contain 16 pieces: 5 pcs Male connectors. 5 pcs Male 90° elbows. 3 pcs Tube tees. 3 pcs Tube unions. Fit type: 1/2", 3/8", 1/4".

👉【Typical Application】: The push-to-connect fitting 1/4 inch are suitable for PU / PA / PE / PVC. The dot air fittings assortment can be used with air systems, and copper tubing in air brake systems. They are widely applied in automotive, manufacturing production lines, car or truck repair, industrial workshops, daily garden or lawn mower repair, towing machine hose connections and so on.

❤️ Application----Special design, suitable for 3/16 inch pipe.The brake tee is easy to install without additional modification, and can directly replace old or damaged ones.

❤️Advantages: compact size design, lightweight compatibility and powerful brake tee make it more reliable. And easy to ope e.Safe Working Pressure: 1841 PSI/ 127 BAR.

❤️Excellent material----Made of high-quality alloy material, strong and durable, not easy to wear. It has the characteristics of high strength and high hardness, is not easy to break, rust-proof, corrosion- , aging- , and has a long service life.

Available in many different styles, including elbows, union, and tees

A large variety of tube diameters and pipe sizes available

Conveniently packaged in diverse piece counts to assist with both small and large projects

Available in many different styles, including elbows, union, and tees

A large variety of tube diameters and pipe sizes available

Conveniently packaged in diverse piece counts to assist with both small and large projects

28 PCS (1/4", 3/8", & 1/2") D.O.T. Air Brake Line Fittings Brass Push to Connect Kit

Tee : 1/2" (2 Pcs), 3/8" (2 Pcs)

Union : 1/2" (2 pcs), 3/8" (2 pcs)

Included for 3/16" Brake Line: Inverted Flare Fittings 12 - 3/8"-24, 3 - 7/16"-24, 2 - 9/16"-18, 2 - 1/2"-20. Inverted Flare Fittings Metric 10 - 10x1mm. Bubble/ISO Flare Fittings 10 - 10x1mm, 2 - 11x1.5mm, 2 - 12x1mm, 2 - 13x1.5mm, Inverted Flare Unions 2 - 3/8"-24, Inverted Flare Unions Metric 2 - 10x1mm, Bubble/ISO Flare Unions 2 - 10x1mm, Inverted Flare 3 Way Tee Block 1 - 10x1mm, 1 - 3/8"-24, Brake Line Clips 10 - 3/16" rubber insulated

Included for 1/4" Brake Line: Inverted Flare Fittings 12 - 7/16"-24, 2 - 9/16"-18, 2 - 1/2"-20, Inverted Flare Unions 2 - 7/16"-24, Inverted Flare 3 way Tee Block 1 - 7/16"-24, Brake Line Clips 10 - 1/4"

The most complete brake line hardware kit for 3/16" & 1/4" tubing

【PREMIUM MATERIAL】：Our air brake fittings are made of high quality CA360 brass,Meets D.O.T FMVSS 571.106 ,SAE J1131 Air Brake system Requirements and Air Brake system Requirements,with corrosion resistance, high temperature ductility and low permeability. Great for long time use, dot air brake fitting pneumatic fittings type: 3/8" .

【EASY TO USE】: Union connect two tube with same OD. All dot air quick connect fittings can be sealed by pushing the tube firmly into the fittings and they are also simple to be removed from the tube.

【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.

【PREMIUM MATERIAL】：Our air brake fittings are made of high quality CA360 brass,Meets D.O.T FMVSS 571.106 ,SAE J1131 Air Brake system Requirements and Air Brake system Requirements,with corrosion resistance, high temperature ductility and low permeability. Great for long time use, dot air brake fitting pneumatic fittings type: 1/4" .

【EASY TO USE】: Union connect two tube with same OD. All dot air quick connect fittings can be sealed by pushing the tube firmly into the fittings and they are also simple to be removed from the tube.

【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.

👉【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.

Available in many different styles including 3-way tees, elbows, unions, and more

Hard-wearing brass or steel construction for a long service life

A wide range of tube diameters and pipe sizes available

【Compact Design】It adopts compact size design, light weight and easy to operate.

【Application】It is suitable for 3/16 inch pipe. Safe working pressure is 1841 PSI/ 127 BAR.

【Easy to Install】This is a replacement brake tee with a wide range of applications and good compatibility, stable and reliable, you can replace directly for old or broken one.

Available in many different styles including 3-way tees, elbows, unions, and more

Hard-wearing brass or steel construction for a long service life

A wide range of tube diameters and pipe sizes available

【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.

Dsnaduo 3AN AN3 Male Flare to AN4 Pipe Male Stainless Steel Brake Hose Fitting Adapter Union Connector,Brake and Clutch Adapter Fitting

Material: Stainless steel 304

Commonly used to mate AN hose ends to NPT ports and lines.

Dsnaduo 4AN AN4 Male Flare to M12x1.25 Pipe Male Stainless Steel Brake Hose Fitting Adapter Union Connector,Brake and Clutch Adapter Fitting

Material: Stainless steel 304

Commonly used to mate AN hose ends to NPT ports and lines.

Available in many different styles, including elbows, union, and tees

A large variety of tube diameters and pipe sizes available

Conveniently packaged in diverse piece counts to assist with both small and large projects

DOT Air Brake Line Fittings 32pcs KIT: Brass Material 3/8”1/2” 1/4” Tube OD; Straight 1/2" Tube x 3/8" NPT 2PCS,3/8" Tube x 3/8" NPT 2PCS,3/8" Tube x 1/2" NPT 2PCS,1/2"Tube x 1/2" NPT 2PCS,1/2" Tube x 1/4" NPT 2PCS;90°Elbow 3/8"Tube x 1/2" NPT 2PCS,3/8" Tube x 3/8" NPT 2PCS,1/2" Tube x 1/2" NPT 2PCS,1/2" Tube x 3/8" NPT 2PCS",1/2" Tube x 1/4" NPT 2PCS";Tube Union 1/2" 2PCS,1/4"" 2PCS,3/8"?2PCS;Tube Tee 1/2" 2PCS,3/8" 2PCS, 1/4"" 2PCS;

Air Brake Line Fittings Typical Application: Air System;Working PRESSURE: Working pressure from vacuum up to 250 psi; Temperature Range: -40° F to +200° F（-40°C to +93°C) ;

How to installation Brass Push to Connect Fitting Kits:Insert the same OD Pneumatic Tube from union two side ;How to Put Out the Tube:Step 1: Depress the end cap;Step 2: Pull out the Pneumatic Tube;

【PREMIUM MATERIAL】：The dot air fittings are made of high quality CA360 brass,Meets D.O.T FMVSS 571.106 ,SAE J1131 Air Brake system Requirements and Air Brake system Requirements,with corrosion resistance, high temperature ductility and low permeability. Great for long time use,dot push to connect air fittings kit pneumatic fittings type: 1/4", 3/8", 1/2" .

【TYPICAL APPLICATION】The dot air line quick connect fittings can be used with air suspension 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.

【EASY TO INSTALL】: Our dot push to connect air fittings simply push tubing in, no tools or loose parts to handle in tight places. Save your effort and time. And pieces that contain a threaded end already have sealant pre applied to provide a secure connection.