Stop Cock Valves | McMaster-Carr

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157 Products

About On/Off Valves

Plastic On/Off Valves with Barbed Fittings

Plastic provides a lightweight and economical alternative to metal. All valves have barbs that grip onto tubing for a secure hold. They’re for use with water, oil, air, and inert gas.

On/Off Valves with Barbed Fittings

These valves have barbs that grip onto tubing, providing a secure hold. Because they’re made of metal, they are more durable than plastic valves and withstand higher temperatures.

On/Off Valves with Quick-Turn Fittings

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. Use these valves with water and oil.

Compact Threaded On/Off Valves

Install these valves in tight spots, such as where pipelines are crowded together. They’re less than half as long as standard threaded valves and one-third shorter in height. Use with water, oil, air, and inert gas.

On/Off Valves with Compression Fittings

For more durability than plastic valves, these are made of metal. A compression sleeve bites into tubing as you tighten the nut, forming a strong seal. Use these valves with water, oil, air, inert gas, and steam.

On/Off Valves with Push-to-Connect Fittings

Insert tubing into the fittings on these valves—no heat, solder, or flux required. They’re for use with water, oil, air, and inert gas.

On/Off Valves with Barbed Fittings for Chemicals

Barbs grip onto tubing, providing a secure hold. To withstand aggressive and corrosive solutions in chemical-processing applications, these valves have a plastic body and a chemical-resistant seal.

Compact Threaded On/Off Valves for Chemicals

For chemical-processing applications in confined areas, these valves have an EPDM seal and a PVC or CPVC body to withstand aggressive and corrosive solutions and a low-profile handle to fit in tight spots.

Plastic On/Off Valves with Push-to-Connect
Fittings for Drinking Water

For a lightweight and economical alternative to metal, these valves are made of plastic. Insert tubing into the fittings—no heat, solder, or flux required. All meet NSF/ANSI 61 for use in drinking water systems.

Threaded On/Off Valves for
Natural Gas and Propane

Use these valves as a mainline shutoff in natural gas and propane pipelines.

Compact Threaded On/Off Valves for Fuel

A low-profile handle allows these valves to fit in low-clearance pipelines for diesel fuel, fuel oil, and kerosene.

Sanitary Sampling Valves

Take liquid samples in sanitary environments—these sampling valves have a hygienic design, so they’re commonly used in breweries and wineries.

Drainage Valves

Also known as stop cocks, install these valves on your tank for easy draining.

Easy-Grip Drainage Valves

The large knob makes these drainage valves easy to grip.

Laboratory Valves and Fittings

Laboratory Valves

Laboratory Flanges and Turrets

Provide a connection for hose cocks, needle valves, and nozzles by attaching these flanges and turrets to your supply pipe.

Gas Sampling Valves for Syringes

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.