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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About Backflow-Prevention Valves
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About On/Off Valves
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On/Off Valves with Luer Lock Fittings
With just a half turn or a light push, these valves connect to luer lock fittings on your line. Their universal connection size fits any luer lock plug or socket.
Polycarbonate valves are lighter in weight than metal valves, but they aren’t as durable. Nickel-plated brass valves are more corrosion resistant and durable than polycarbonate valves. 303 stainless steel valves have the best corrosion resistance.
Connections without a locking ring are quicker to install and remove than those with a locking ring. Also known as luer slip connections, all they need is a light push. Add a snap-on ring (sold separately) to lock your connection in place and color code your line.
Connections with a locking ring are more secure than those without a locking ring, so they’re better for high pressures. Give the ring a half turn to lock them in place. You can’t remove the locking ring.
Barbed connections grip onto tubing for a secure hold.
Lock Male without
Locking Ring
Locking Ring × Luer Lock
Male without Locking Ring
Locking Ring × Luer Lock
Male without Locking Ring
Ring × Luer Lock
Male with Locking Ring
- Valve Type: Stop Cock
- For Use With: Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon
| Max. Pressure | End-to-End Lg. | Each | |
Luer Lock Female × Luer Lock Female | |||
|---|---|---|---|
| 50 psi @ 70° F | 1 3/16" | 0000000 | 00000 |
Luer Lock Female × Luer Lock Male without Locking Ring | |||
| 50 psi @ 70° F | 1 3/8" | 0000000 | 0000 |
Luer Lock Male without Locking Ring × Luer Lock Male without Locking Ring | |||
| 50 psi @ 70° F | 1 1/2" | 0000000 | 0000 |
Luer Lock Male with Locking Ring × Luer Lock Female | |||
| 50 psi @ 70° F | 1 3/8" | 0000000 | 0000 |
Luer Lock Male with Locking Ring × Luer Lock Male without Locking Ring | |||
| 50 psi @ 70° F | 1 1/2" | 0000000 | 0000 |
Luer Lock Male with Locking Ring × Luer Lock Male with Locking Ring | |||
| 50 psi @ 70° F | 1 1/2" | 0000000 | 0000 |
Locking Ring ×
Luer Lock Female
Ring × Luer Lock
Male with Locking Ring
- Valve Type: Stop Cock
- For Use With: Oil, Water
| For Tube ID | Max. Pressure | End-to-End Lg. | Each | |
Luer Lock Female × Luer Lock Female | ||||
|---|---|---|---|---|
| __ | 4.5 psi @ 70° F | 1 1/8" | 0000000 | 0000000 |
Luer Lock Male without Locking Ring × Luer Lock Female | ||||
| __ | 4.5 psi @ 70° F | 1 1/4" | 0000000 | 000000 |
Luer Lock Male with Locking Ring × Luer Lock Female | ||||
| __ | 4.5 psi @ 70° F | 1 3/8" | 0000000 | 000000 |
Luer Lock Male with Locking Ring × Luer Lock Male with Locking Ring | ||||
| __ | 4.5 psi @ 70° F | 1 5/8" | 0000000 | 000000 |
Luer Lock Male with Locking Ring × Barbed | ||||
| 1/4" | 4.5 psi @ 70° F | 1 5/8" | 0000000 | 000000 |
| 5/16" | 4.5 psi @ 70° F | 1 5/8" | 0000000 | 000000 |
- Valve Type: Stop Cock
- For Use With: Water
| Max. Pressure | End-to-End Lg. | Each | |
Luer Lock Male with Locking Ring × Luer Lock Female | |||
|---|---|---|---|
| 4.5 psi @ 70° F | 1 3/8" | 0000000 | 0000000 |
Check Valves with Quick-Turn Fittings
- For Use With: Air, Water
- Diaphragm Material: Silicone Rubber
- Seal Material: Silicone Rubber
Also known as luer lock couplings, quick-turn fittings consist of a plug and a socket that connect with a half turn, so you can easily connect and disconnect your line. These valves open to allow flow in one direction and close when flow stops or reverses. The clear body allows you to visually inspect flow and debris accumulation.
| Gender | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
Polycarbonate Plastic Body  | |||||||
|---|---|---|---|---|---|---|---|
Quick-Turn | |||||||
| Female Inlet × Female Outlet | 50 psi @ 65° F | 0.5 | -80° to 275° | Clear | 1" | 000000 | 00000 |
| Female Inlet × Male Outlet | 50 psi @ 65° F | 0.5 | -80° to 275° | Clear | 1 1/4" | 000000 | 0000 |
| Male Inlet × Male Outlet | 50 psi @ 65° F | 0.5 | -80° to 275° | Clear | 1 1/2" | 000000 | 0000 |
| Male Inlet × Female Outlet | 50 psi @ 65° F | 0.5 | -80° to 275° | Clear | 1 1/4" | 000000 | 0000 |
Plastic Luer Lock Tube Couplings with Shut-Off for Air and Water
A built-in shut-off valve stops the flow when you separate these couplings, so air or water won’t leak from your line. Highly versatile, these couplings are compatible with any luer lock plug, socket, syringe, or needle. They secure with a half turn, 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.
Made of nylon, these couplings are lightweight and have good impact and abrasion resistance.
Note: For a complete coupling, order a plug and a socket.
- Temperature Range: -50° to 150° F
- Tubing: Use with firm or soft (Durometer 35A-85A) PVC plastic or silicone rubber
Barbed plugs and sockets insert into tubing and secure with a clamp.
| For Tube ID | Material | Color | Max. Pressure | Each | |
| 1/16" | Nylon Plastic | Gray | 120 psi @ 72° F | 0000000 | 00000 |
| 3/32" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
| 1/8" | Nylon Plastic | Gray | 120 psi @ 72° F | 0000000 | 0000 |
| 5/32" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
| 3/16" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
| 1/4" | Nylon Plastic | Gray | 120 psi @ 72° F | 0000000 | 0000 |
| 5/16" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
- Temperature Range: -50° to 150° F
- Tubing: Use with firm or soft (Durometer 35A-85A) PVC plastic or silicone rubber
Barbed plugs and sockets insert into tubing and secure with a clamp.
| For Tube ID | Material | Color | Max. Pressure | Each | |
| 1/16" | Nylon Plastic | Gray | 120 psi @ 72° F | 0000000 | 00000 |
| 3/32" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
| 1/8" | Nylon Plastic | Gray | 120 psi @ 72° F | 0000000 | 0000 |
| 5/32" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
| 3/16" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
| 1/4" | Nylon Plastic | Gray | 120 psi @ 72° F | 0000000 | 0000 |
| 5/16" | Nylon Plastic | Gray | 120 psi @ 72° F | 00000000 | 0000 |
- Temperature Range: -50° to 150° F
Through-wall couplings are also known as bulkhead couplings and panel-mount couplings. They fit through a wall or panel to create an inlet or outlet.
| Material | Color | Max. Pressure | For Hole Dia. | For Max. Wall Thick. | Each | |
| Nylon Plastic | Gray | 120 psi @ 72° F | 5/8" | 1/4" | 00000000 | 00000 |
- Temperature Range: -50° to 150° F
Through-wall couplings are also known as bulkhead couplings and panel-mount couplings. They fit through a wall or panel to create an inlet or outlet.
| Material | Color | Max. Pressure | For Hole Dia. | For Max. Wall Thick. | Each | |
| Nylon Plastic | Gray | 120 psi @ 72° F | 5/8" | 1/4" | 00000000 | 00000 |
Gas Sampling Valves for Syringes
- Valve Type: Plug
- For Use With: Butane, Carbon Dioxide, Natural Gas, Nitrogen, Oxygen
Convert an everyday syringe into a gas sampling syringe. These valves allow you to collect, transport, and store gas samples without worrying about evaporation or leaks. Slide the female end over the base of your syringe and attach a needle to the male side.
| Flow Pattern | Maximum Pressure | Temperature Range | End-to-End Lg. | Autoclavable | Each | |
Plastic Body with Standard Lever Handle | ||||||
|---|---|---|---|---|---|---|
Female Luer Lock × Male Luer Lock | ||||||
| Straight | 100 psi @ 70° F | Not Rated | 1" | Yes | 0000000 | 0000000 |