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.
Caps fit over a tube stem end of a fitting or a piece of tubing.
| For Tube OD | Material | Color | Release Ring Color | Max. Pressure | Each | |
| 1/8" | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 00000 |
| 5/32" | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 1/4" | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 5/16" | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 3/8" | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 4mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 6mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 8mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 10mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 12mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
| 14mm | Nylon Plastic | Black | Black | 290 psi @ 72° F | 00000000 | 0000 |
Plugs insert into the push-to-connect end of a fitting.
| Tube Stem OD | Material | Color | Max. Pressure | Each | |
Nylon Plastic | |||||
|---|---|---|---|---|---|
| 1/8" | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 00000 |
| 5/32" | Nylon Plastic | Red | 290 psi @ 72° F | 00000000 | 000 |
| 3/16" | Nylon Plastic | Red | 290 psi @ 72° F | 00000000 | 0000 |
| 1/4" | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 5/16" | Nylon Plastic | Red | 290 psi @ 72° F | 00000000 | 0000 |
| 3/8" | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 1/2" | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 3mm | Nylon Plastic | Red | 290 psi @ 72° F | 00000000 | 0000 |
| 4mm | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 000 |
| 6mm | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 8mm | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 10mm | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 12mm | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
| 14mm | Nylon Plastic | Red | 290 psi @ 72° F | 0000000 | 0000 |
Each | ||||||
|---|---|---|---|---|---|---|
| For Tube OD | Material | Choose a Color | 1-19 | 20-99 | 100-Up | |
| 1/8" | Nylon Plastic | Yellow | 00000000 | 00000 | 00000 | 00000 |
| 5/32" | Nylon Plastic | 00000000 | 000 | 000 | 000 | |
| 1/4" | Nylon Plastic | 00000000 | 000 | 000 | 000 | |
| 5/16" | Nylon Plastic | 00000000 | 000 | 000 | 000 | |
| 3/8" | Nylon Plastic | 00000000 | 000 | 000 | 000 | |
| 6mm | Nylon Plastic | 00000000 | 000 | 000 | 000 | |
| 10mm | Nylon Plastic | 00000000 | 0000 | 000 | 000 | |
| 12mm | Nylon Plastic | 00000000 | 0000 | 000 | 000 | |
Low-Temperature D.O.T. Push-to-Connect Tube Fittings for Air
- Temperature Range: -40° to 210° F
- Tubing: Use with hard (Durometer 65D) nylon plastic
- Specifications Met: D.O.T. FMVSS 571, SAE J1131, SAE J2494-1, SAE J2494-3
except Identification Rings: D.O.T. FMVSS 571
Connect air brake lines with fittings that won’t crack in sub-zero temperatures. They meet Department of Transportation FMVSS 571 safety standards, so they’re often used in commercial trucks and trailers. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. Fittings have a built-in tube support that slips inside the tubing to prevent it from collapsing. To disconnect, push on the release ring and pull the tubing out of the fitting. They have good corrosion resistance. Use them at up to 150 psi and attach them to hard tubing.
Tight-Seal Plastic Barbed Tube Fittings for Air and Water
Minimize leaks in your line—these fittings have a single barb that creates a smooth clamping surface for extra-tight connections. Fittings are nylon for excellent impact and abrasion resistance.
- Temperature Range: -50° to 275° F
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber or PVC plastic
- Clarity: Black: Opaque; Off-White: Semi-Clear
| For Tube ID | Material | Max. Pressure | Pkg. Qty. | Choose a Color | Pkg. | |
| 1/16" | Nylon Plastic | Not Rated | 10 | 0000000 | 00000 | |
| 3/32" | Nylon Plastic | Not Rated | 10 | 0000000 | 0000 | |
| 1/8" | Nylon Plastic | Not Rated | 10 | 0000000 | 0000 | |
| 5/32" | Nylon Plastic | Not Rated | 10 | 0000000 | 0000 | |
| 3/16" | Nylon Plastic | Not Rated | 10 | 0000000 | 00000 | |
| 1/4" | Nylon Plastic | Not Rated | 10 | 0000000 | 00000 | |
| 3/8" | Nylon Plastic | Not Rated | 10 | 0000000 | 00000 | |
| 1/2" | Nylon Plastic | Not Rated | 10 | 0000000 | 00000 | |
| 5/8" | Nylon Plastic | Not Rated | 10 | 0000000 | 00000 |
Plastic Luer Lock Tube Couplings for Air and Water
- For Use With: Nylon Plastic: Air, Water
Polycarbonate Plastic: Air
Polypropylene Plastic: Water - Temperature Range: See table
- Tubing: Use with soft (Durometer 40A-65A) PVC plastic or silicone rubber
Made of plastic, these couplings are lighter in weight than metal luer lock couplings. They're a popular choice in labs because of their versatility—they fit any other luer lock plug, socket, syringe, or needle. Quick to attach and detach, they’re often used in lines that are frequently disconnected. They have a compact body for easy installation in tight spaces. Use them in low-pressure applications. These couplings are open-flow style, so there is no shut-off valve to stop the flow when they’re separated.
Nylon couplings have excellent impact and abrasion resistance. They’re for general purpose applications.
Plugs with a locking ring are more secure than those without a locking ring. Give the ring a half turn to lock these couplings in place. You can’t remove the locking ring.
Plugs without a locking ring are quicker to install and remove than those with a locking ring. Also known as luer slip couplings, all they need is a light push to secure. Add a snap-on ring (sold separately) to lock your coupling in place and color code your line.
Note: For a complete coupling, order a plug and a socket.
Tie plugs with a tether ring to equipment so they’re always where you need them.
Plugs with a vented tip release fluid and gases trapped below the cap, making them a good choice for vacuum applications.
| Color | Clarity | Max. Pressure | Temp. Range, °F | Features | Locking Ring Included | Pkg. Qty. | Pkg. | |
Nylon Plastic | ||||||||
|---|---|---|---|---|---|---|---|---|
Open Tip | ||||||||
| Red | Opaque | Not Rated | Not Rated | __ | With Locking Ring | 10 | 000000000 | 00000 |
| White | Opaque | 40 psi @ 72° F | -20° to 200° F | __ | With Locking Ring | 10 | 000000000 | 0000 |
| White | Opaque | Not Rated | Not Rated | Tether Ring | Without Locking Ring | 10 | 000000000 | 0000 |
| White | Opaque | Not Rated | Not Rated | Vented Tip | With Locking Ring | 10 | 000000000 | 0000 |
Closed Tip | ||||||||
| White | Opaque | Not Rated | Not Rated | __ | With Locking Ring | 10 | 000000000 | 0000 |
Combo cap/plugs close off a plug on one end and a socket with the other. They save space by doing the job of both a cap and an end plug.
| Color | Clarity | Max. Pressure | Temp. Range, °F | Locking Ring Included | Pkg. Qty. | Pkg. | |
Nylon Plastic | |||||||
|---|---|---|---|---|---|---|---|
Open Tip | |||||||
| White | Opaque | Not Rated | Not Rated | With Locking Ring | 10 | 000000000 | 00000 |
Push-to-Connect Tube Fittings for Hot Drinking Water
- Temperature Range: 35° to 200° F
- Tubing: Use with hard polyethylene plastic
- Specifications Met: NSF/ANSI 51, NSF/ANSI 61
Run hot water through these fittings at temperatures up to 200° F. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings are nylon for excellent impact and abrasion resistance.
Plugs insert into the push-to-connect end of a fitting.
| Tube Stem OD | Material | Color | Max. Pressure | Each | |
| 5/32" | Nylon Plastic | White | 230 psi @ 72° F | 00000000 | 00000 |
| 1/4" | Nylon Plastic | White | 230 psi @ 72° F | 00000000 | 0000 |
| 5/16" | Nylon Plastic | White | 230 psi @ 72° F | 00000000 | 0000 |
| 3/8" | Nylon Plastic | White | 190 psi @ 72° F | 00000000 | 0000 |
| 1/2" | Nylon Plastic | White | 160 psi @ 72° F | 00000000 | 0000 |
| 4mm | Nylon Plastic | White | 230 psi @ 72° F | 00000000 | 0000 |
| 6mm | Nylon Plastic | White | 230 psi @ 72° F | 00000000 | 0000 |
| 8mm | Nylon Plastic | White | 230 psi @ 72° F | 00000000 | 0000 |
| 10mm | Nylon Plastic | White | 190 psi @ 72° F | 00000000 | 0000 |
| 12mm | Nylon Plastic | White | 190 psi @ 72° F | 00000000 | 0000 |
Caps fit over a tube stem end of a fitting or a piece of tubing.
| For Tube OD | Material | Color | Release Ring Color | Max. Pressure | Each | |
| 5/32" | Nylon Plastic | White | Gray | 230 psi @ 72° F | 00000000 | 00000 |
| 1/4" | Nylon Plastic | White | Gray | 230 psi @ 72° F | 00000000 | 0000 |
| 5/16" | Nylon Plastic | White | Gray | 230 psi @ 72° F | 00000000 | 0000 |
| 3/8" | Nylon Plastic | White | Gray | 190 psi @ 72° F | 00000000 | 0000 |
| 4mm | Nylon Plastic | White | Gray | 230 psi @ 72° F | 00000000 | 0000 |
| 6mm | Nylon Plastic | White | Gray | 230 psi @ 72° F | 00000000 | 0000 |
| 8mm | Nylon Plastic | White | Gray | 230 psi @ 72° F | 00000000 | 0000 |
| 10mm | Nylon Plastic | White | Gray | 190 psi @ 72° F | 00000000 | 0000 |
| 12mm | Nylon Plastic | White | Gray | 160 psi @ 72° F | 00000000 | 0000 |
Luer Lock Tube Couplings for Plastic and Rubber Tubing—High-Purity
- For Use With: Air, Water
- Temperature Range: Nylon Plastic: -50° to 275° F
Polyolefin Plastic: Up to 355° F
Polypropylene Plastic: -5° to 150° F - Tubing: Use with soft or firm (Durometer 50A-95A) polyolefin plastic, PVC plastic, silicone rubber, TPE plastic, or TPU plastic
To prevent contamination, these couplings are cleaned, double bagged, and packaged in a clean room. This makes them a great choice for applications where cleanliness is critical, such as semiconductor manufacturing. Known for their versatility, they fit any luer lock plug, socket, syringe, or needle. They’re quick to attach and detach, so they’re often used in lines that are frequently disconnected. Thanks to their compact body, they fit in tight spaces. Use them in low-pressure applications.
Note: For a complete coupling, order a plug and a socket.
Nylon couplings have excellent impact and abrasion resistance. Use them in general purpose applications.
Plugs with a locking ring are more secure than those without a locking ring. Give the ring a half turn to lock them in place. You can’t remove the locking ring.
| Color | Clarity | Max. Pressure | Environmental Rating | Pkg. Qty. | Pkg. | |
Nylon Plastic | ||||||
|---|---|---|---|---|---|---|
| White | Opaque | 150 psi @ 72° F | ISO Class 7 | 5 | 00000000 | 00000 |
| Color | Clarity | Max. Pressure | Environmental Rating | Locking Ring Included | Pkg. Qty. | Pkg. | |
Nylon Plastic | |||||||
|---|---|---|---|---|---|---|---|
Open Tip | |||||||
| White | Opaque | 150 psi @ 72° F | ISO Class 7 | With Locking Ring | 5 | 00000000 | 00000 |