How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Push-to-Connect Tube Fittings for Air

- Temperature Range: 0° to 170° F, except polybutylene plastic fittings are 32° to 140° F
- Tubing: Use with firm (Durometer 95A-45D) polyethylene plastic or polyurethane rubber
- Specifications Met: ISO 14743, except cartridges and polybutylene plastic fittings
Insert tubing into these fittings and an internal gripping ring and O-ring hold the tubing tight. They are also known as instant fittings. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings have good corrosion resistance. Use them in low-pressure applications.
Identification rings (sold separately) snap over the release ring so you can color-code your lines.
Clips (sold separately) align and organize your tubing and fittings.
For technical drawings and 3-D models, click on a part number.

DIN rail connectors clip into a DIN rail to connect and organize your tubing—no tools required. They’re great for running tubing side by side with electrical components. For easy organization, add a label to the slot on these connectors to identify your tubing. They also have a test point that pops out to let you know when your tubing has air in it. After you press it in by hand, it pops out when air is present.
For Tube OD | Material | Color | Release Ring Color | Max. Pressure | For DIN Rail Trade Size | For DIN Rail Height, mm | Each | |
6mm | Nylon Plastic | Black | Black | 140 psi @ 72° F | DIN 3 | 35 | 00000000 | 000000 |

Use plugs to close off unused manifold holes.

Use plugs to close off unused manifold holes.
Number of Inlets | For Tube OD (Inlet) | For Tube OD (Outlet) | Material | Color | Release Ring Color | Max. Pressure | Mount Type | Mounting Fasteners Included | Each | |
3 Outlets | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
2 | 1/4" | 5/32" | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 00000000 | 000000 |
2 | 5/16" | 5/32" | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 00000000 | 00000 |
2 | 3/8" | 1/4" | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 00000000 | 00000 |
2 | 6mm | 4mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 8mm | 4mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 8mm | 6mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 10mm | 6mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 10mm | 8mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
6 Outlets | ||||||||||
2 | 1/4" | 5/32" | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 00000000 | 00000 |
2 | 5/16" | 5/32" | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 00000000 | 00000 |
2 | 3/8" | 1/4" | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 00000000 | 00000 |
2 | 6mm | 4mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 8mm | 4mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 8mm | 6mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 10mm | 6mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
2 | 10mm | 8mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | Screw On | No | 0000000 | 00000 |
Universal-Thread Push-to-Connect Tube Fittings for Air and Water


Threads
with Gasket
- Temperature Range: 0° to 175° F
- Tubing: Use with firm (Durometer 85A-100A) nylon plastic or polyurethane rubber
- Specifications Met: ISO 14743
Make lightweight connections without the hassle of matching the exact thread type—these fittings connect to NPT, NPTF, BSPP, BSPT, and other universal threads. With a nylon body and nickel-plated brass threads, these fittings are lighter than most metal fittings, and withstand corrosion better than plain brass threads. They also have a reusable gasket to guard against leaks. Connect the tube ends to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect them, push the release ring and pull the tubing out of the fitting. These fittings are sometimes known as instant fittings. All meet ISO 14743, which is an international standard for push-to-connect fittings for plastic tubing.
For technical drawings and 3-D models, click on a part number.


Threads
with Gasket
Release Ring | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | For Tube OD | Pipe Connection Material | Tube Connection Material | Gasket Material | Color | Material | Color | Maximum Pressure | Each | |
BSPP, BSPT, NPT, NPTF, Universal Threads | ||||||||||
1/8 | 4mm | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Black | 250 psi @ 72° F | 00000000 | 000000 |
1/8 | 6mm | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Black | 250 psi @ 72° F | 00000000 | 00000 |
1/4 | 4mm | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Black | 250 psi @ 72° F | 00000000 | 00000 |
1/4 | 6mm | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Black | 250 psi @ 72° F | 00000000 | 00000 |


Threads
with Gasket
Release Ring | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of Inlets | For Tube OD (Inlet) | Pipe Size (Inlet) | Number of Outlets | For Tube OD (Outlet) | Pipe Connection Material | Tube Connection Material | Gasket Material | Color | Material | Color | Maximum Pressure | Each | |
BSPP, BSPT, NPT, NPTF, Universal Threads | |||||||||||||
2 | 1/4" | 1/8 | 3 | 5/32" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 000000 |
2 | 1/4" | 1/4 | 3 | 5/32" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
2 | 5/16" | 1/8 | 3 | 5/32" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
2 | 5/16" | 1/8 | 3 | 1/4" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
2 | 5/16" | 1/4 | 3 | 5/32" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
2 | 5/16" | 1/4 | 3 | 1/4" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
2 | 3/8" | 1/4 | 3 | 1/4" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
2 | 3/8" | 3/8 | 3 | 1/4" | Nickel-Plated Brass | Nylon Plastic | Buna-N Rubber | Black | Plastic | Blue | 250 psi @ 72° F | 00000000 | 00000 |
Low-Temperature/High-Pressure D.O.T. Push-to-Connect Tube Fittings for Air

- Temperature Range: -40° to 200° F
- Tubing: Use with hard (Durometer 65D) nylon plastic
- Specifications Met:
Cartridges: D.O.T. FMVSS 571, SAE J2494-4, SAE J1131
All other fittings: D.O.T. FMVSS 571
Connect high-pressure brake lines with fittings that won’t crack in frigid temperatures. Often used on commercial trucks and trailers, these fittings meet Department of Transportation FMVSS 571 safety standards. Also known as instant fittings, they connect to tubing with a simple push, and an internal gripping ring and O-ring will hold the tubing tight. A built-in tube support slips inside the tubing to prevent it from collapsing. To disconnect, push on the release ring and pull the tubing out of the fitting. All have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.

Plugs insert into the push-to-connect end of another fitting.
Connectors | Plugs | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Number of Inlets | For Tube OD (Inlet) | Number of Outlets | For Tube OD (Outlet) | Material | Color | Release Ring Material | Max. Pressure | Each | Each | ||
2 | 1/4" | 4 | 1/4" | Nylon Plastic | Black | Brass | 250 psi @ 72° F | 00000000 | 000000 | 0000000 | 00000 |
2 | 3/8" | 4 | 3/8" | Nylon Plastic | Black | Brass | 250 psi @ 72° F | 00000000 | 000000 | 0000000 | 0000 |
2 | 1/2" | 4 | 1/2" | Nylon Plastic | Black | Brass | 250 psi @ 72° F | 00000000 | 000000 | 0000000 | 0000 |