How to Identify and Measure Fittings
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Aluminum Quick-Connect Pipe Fittings for Compressed Air
Twist these fittings onto aluminum pipe for quick, sealed connections—no threading, soldering, or welding necessary. Use them to build a compressed air system in half the time it would take to build a copper or steel system. Also known as Unipipe fittings, they’re part of a quick-connect system that’s compatible with pipe from Unipipe, Transair, and Infinity.
Finger tighten the collar on the end of these fittings, then use a wrench for the final quarter turn. The inside of these fittings has a compression ring and O-ring to seal against the pipe. They’re easy to take apart as needed to modify your setup.
Choose fittings with a blue or gray collar for easy identification. Fittings with a blue collar are often used for compressed air systems. Fittings with a gray collar are often used for vacuum systems.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
- Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum
| For Pipe OD | Socket Dp., mm | Material | Color | Max. Pressure | Each | |
Blue Collar | ||||||
|---|---|---|---|---|---|---|
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 000000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Gray Collar | ||||||
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
- Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum
Threaded connections can be taken apart as needed for maintenance and repair.
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
Threaded connections can be taken apart as needed for maintenance and repair.
(A) | |||||||
|---|---|---|---|---|---|---|---|
| For Pipe OD | Socket Dp., mm | Pipe Size (B)  | Material | Color | Max. Pressure | Each | |
Blue Collar | |||||||
NPT Threads | |||||||
| 3/4" (20 mm) | 35 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 000000 |
| 1" (25 mm) | 37 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1" (25 mm) | 37 | 3/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 1 1/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Gray Collar | |||||||
NPT Threads | |||||||
| 3/4" (20 mm) | 35 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1" (25 mm) | 37 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1" (25 mm) | 37 | 3/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 1 1/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
- Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum
| For Pipe OD | Socket Dp., mm | Material | Color | Max. Pressure | Each | |
Blue Collar | ||||||
|---|---|---|---|---|---|---|
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 000000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Gray Collar | ||||||
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Use measuring tools to mark your pipe’s proper insertion depth so you know if it’s inserted far enough into the fitting.
| Max. Dp. Measured, mm | Lg., mm | Wd., mm | Material | Each | |
| 160 | 224 | 39 | Plastic | 0000000 | 000000 |
Plastic Quick-Disconnect Tube Couplings for Air and Water
Lighter in weight than their metal counterparts, these quick-disconnect couplings are made of acetal plastic. They are moisture resistant, so they won’t absorb water and lose strength, even in high-humidity environments. A complete coupling consists of a plug and socket; choose a set for both, or select a plug and socket separately. Because they're quick disconnect, they're helpful for lines you frequently need to access.
Plugs and sockets with shut-off have a valve to stop the flow when the coupling is separated, so air or water won’t spill from your line.
Note: For a complete coupling, order a plug and a socket with the same coupling size.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: -40° to 180° F
- Tubing: Use with soft or firm (Durometer 70A-85A) polyurethane rubber
Barbed plugs and sockets insert into tubing.
| For Tube ID | Coupling Size | Plug OD | Barbed Connection Type | Material | Color | Max. Pressure | Each | |
Open Flow | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8" | 1/8 | 5/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/8 | 5/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 0000 |
| 1/4" | 1/4 | 7/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 0000 |
| 3/8" | 1/4 | 7/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 0000 |
With Shut-Off | ||||||||
| 1/8" | 1/8 | 5/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/8 | 5/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/4 | 7/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4 | 7/16" | Clamp On | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
- Temperature Range: -40° to 180° F
- Tubing: Use with firm or hard (Durometer 85A-60D) nylon plastic or polyethylene plastic
| For Tube OD | For Tube ID | Coupling Size | Plug OD | Material | Color | Max. Pressure | Each | |
Open Flow | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4" | 11/64" | 1/8 | 5/16" | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4" | 1/4 | 7/16" | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 0000 |
| 4mm | 2.5mm | 1/8 | 5/16" | Acetal Plastic | White | 100 psi @ 72° F | 00000000 | 0000 |
With Shut-Off | ||||||||
| 1/4" | 11/64" | 1/8 | 5/16" | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4" | 1/4 | 7/16" | Acetal Plastic | White | 120 psi @ 72° F | 00000000 | 00000 |
High-Pressure Quick-Disconnect Tube Couplings for Air
Not only are these chrome-plated brass couplings corrosion resistant, they’re also durable enough to handle pressures up to 250 psi and can be used with vacuum. Couplings consist of a plug and a socket (sold separately) that join with a latch, so you can frequently connect and disconnect your line. To connect, insert the plug into the socket; to disconnect, press the latch on the socket and remove the plug.
Plugs and sockets with open flow control give you higher flow rates than those with shut-off flow control. They also minimize pressure drops across the connection. For the best flow rates, pair an open flow plug with an open flow socket. Plugs and sockets with shut-off flow control have a valve that stops air from leaking out when you detach the coupling.
Note: For a complete coupling, order a plug and a socket with the same coupling size.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: -40° to 180° F
- Tubing: Use with soft or firm (Durometer 70A-80A) polyurethane rubber
Barbed couplings tightly grip your tube or hose for a secure hold.
Open Flow | With Shut-Off | |||||||
|---|---|---|---|---|---|---|---|---|
| For Tube ID | Coupling Size | Plug OD | Material | Max. Pressure | Each | Each | ||
| 1/8" | 1/8 | 5/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 000000 | 00000000 | 000000 |
| 1/4" | 1/8 | 5/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4" | 1/4 | 7/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 3/8" | 1/4 | 7/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
- Temperature Range: -40° to 180° F
- Tubing: Use with firm or hard (Durometer 85A-60D) nylon plastic or polyethylene plastic
Compression fittings bite into hard metal or plastic tubing in low-pressure and medium-pressure applications. They’re also known as flareless fittings.
Open Flow | With Shut-Off | |||||||
|---|---|---|---|---|---|---|---|---|
| For Tube OD | Coupling Size | Plug OD | Material | Max. Pressure | Each | Each | ||
| 5/32" | 1/8 | 5/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 000000 | 00000000 | 000000 |
| 1/4" | 1/8 | 5/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4" | 1/4 | 7/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 3/8" | 1/4 | 7/16" | Chrome-Plated Brass | 250 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
Quick-Disconnect Tube Couplings for Food and Beverage
- Temperature Range:
Acetal Plastic: -40° to 180° F
Polypropylene Plastic: 32° to 160° F - Tubing:
Barbed Fittings: Use with soft or firm (Durometer 65A-80A) polyurethane rubber
Compression Fittings: Use with hard or firm (Durometer 80A-60D) nylon or polyethylene plastic - Specifications Met: NSF/ANSI 169
Couplings consist of a plug and a socket (sold separately) that join with a latch, so you can frequently connect and disconnect your line. To connect, insert the plug into the socket; to disconnect, press the latch on the socket and remove the plug. They’re made of FDA-approved materials, including moisture-resistant plastic that won’t absorb liquid and lose strength, even in high-humidity food and beverage applications.
Plugs and sockets with shut-off have a valve to stop the flow when the coupling is separated, so fluid won’t spill from your line.
Note: For a complete coupling, order a plug and a socket with the same coupling size.
For technical drawings and 3-D models, click on a part number.
Barbed plugs insert into tubing and secure with a clamp.
| Coupling Size | Plug OD | For Tube ID | Material | Color | Clarity | Max. Pressure | Each | |
Open Flow | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | 7/16" | 1/4" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 0000 |
With Shut-Off | ||||||||
| 1/4 | 7/16" | 1/4" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 00000 |
Quick-Disconnect Tube Couplings for Chemicals
Couplings consist of a plug and a socket (sold separately) that join with a latch, so you can frequently connect and disconnect your line. To connect, insert the plug into the socket; to disconnect, press the latch on the socket and remove the plug. Plugs and sockets are polypropylene, which has excellent chemical, impact, and abrasion resistance.
Plugs and sockets with shut-off have a valve to stop the flow when the coupling is separated so fluid won’t spill from your line.
Note: For a complete coupling, order a plug and a socket with the same coupling size.
For technical drawings and 3-D models, click on a part number.
- For Use With: Ammonia, Ethanol, Phosphoric Acid (70%), Sodium Carbonate
- Temperature Range: 32° to 160° F
Barbed plugs insert into tubing and secure with a clamp.
Open Flow | With Shut-Off | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube ID | Coupling Size | Plug OD | Material | Color | Max. Pressure | Each | Each | ||
| 1/8" | 1/8 | 5/16" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 000000 | 00000000 | 000000 |
| 1/4" | 1/8 | 5/16" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4" | 1/4 | 7/16" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 3/8" | 1/4 | 7/16" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 3/8" | 3/8 | 3/4" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/2" | 3/8 | 3/4" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
Quick-Disconnect Hose Couplings for Coolant
Also known as coolant-line mold couplings, these couplings are often used to install and remove coolant lines in molding and die casting applications. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them when you need frequent access to a line. All of the quick-disconnect coolant plugs are compatible with any of the quick-disconnect coolant sockets of the same coupling size, regardless of the pipe size or barbed hose ID.
Open-flow plugs and sockets do not have a shut-off valve, so the couplings allow for maximum flow. Sockets are sleeve-lock style. To connect, slide back the sleeve on the socket, insert the plug, and release the sleeve. To disconnect, slide back the sleeve and pull out the plug.
Sockets with a barbed end insert into plastic or rubber hose and secure with a clamp.
Brass plugs and sockets have better corrosion resistance than zinc-plated steel, and are softer, so they’re easier to thread together.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
Warning: For open-flow plugs and sockets, stop the flow of coolant before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Temperature Range: -30° to 400° F
- Attachment Type: Use Worm-Drive Clamps or Band-and-Buckle Clamps
- Compatible With: Hansen FT
- Maximum Pressure: 200 psi @ 72° F
- Temperature Range: -30° to 400° F
- Attachment Type: Use Worm-Drive Clamps or Band-and-Buckle Clamps
- Compatible With: Foster FP, Foster FS, Hansen FT, Parker Moldmate