Cock Valves | McMaster-Carr

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176 Products

About On/Off Valves

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 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 Luer Lock Fittings

With just a half turn or a light push, these valves connect to luer lock fittings on your line.

On/Off Valves with Compression Fittings

Made of metal, these valves are more durable than plastic valves and withstand higher temperatures. A compression sleeve bites into tubing as you tighten the nut, forming a strong seal.

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 Chemicals

For chemical-processing applications in confined areas, these valves have a low-profile handle to fit in tight spots. A rubber seal and a plastic body stand up to aggressive, corrosive solutions.

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.

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

Insert your tubing into the fittings of these valves with just a push—the internal rings will grip it tight. Made of plastic, these valves are a lightweight alternative to metal valves. All meet NSF/ANSI 61 for safe use with drinking water.

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.

Drain Valves

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

High-Temperature Drain Valves

Empty fluid from tanks in boiler rooms or heat transfer systems—these valves withstand higher temperatures than our other drain valves. Also known as stop cocks.

Laboratory Valves

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.