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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Color/Shape-Match Quick-Disconnect Hose Couplings for Air and Water
Couplings are color coded by shape so you can’t mix hose lines. Only plugs and sockets of the same color and coupling size will fit together. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them if you need frequent access to a line. Plugs and sockets are brass and 303 stainless steel for good corrosion resistance.
Plugs are also known as nipples.
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air or water won’t leak from the line. They are push-to-connect style. To connect, push the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
Plugs and sockets with a barbed end insert into plastic or rubber hose and secure with a clamp or a crimp-on hose ferrule.
NPSF (National Pipe Straight Fuel) threads are compatible with NPT threads.
Note: To ensure a correct fit, make sure that the plug and socket have the same color and coupling size.
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
Plug Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Band Material | Plug Shape | Each | |
Blue Band | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 000000 |
| 3/8 | 7/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Green Band | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 7/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Red Band | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 7/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
For Plug Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Sleeve Material | For Plug Shape | Each | |
Blue Sleeve | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 000000 |
| 3/8 | 11/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPSF | Anodized Aluminum | Hex | 00000000 | 00000 |
Green Sleeve | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 11/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Red Sleeve | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 11/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
- Attachment Type: Use Worm-Drive Clamps or Crimp-On Hose Ferrules