Sampling Cocks | McMaster-Carr

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151 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 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 a low-profile handle to fit in tight spots. A rubber seal and a plastic body stand up to aggressive, corrosive solutions.

Sampling Valves for Fuel

Often installed on petroleum loading arms to test fuel quality without interrupting flow, these valves are fire-tested to meet American Petroleum Institute (API) 607, Edition 5, for securely isolating fluid and preventing the spread of fire.

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.

Drain Valves

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

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.

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About On/Off Valves

Flow and Level Monitoring and Control

Compact Threaded On/Off Valves

On/Off Valves with Barbed Fittings

On/Off Valves with Luer Lock Fittings

On/Off Valves with Barbed Fittings for Chemicals

Compact Threaded On/Off Valves for Chemicals

Sampling Valves for Fuel

High-Temperature Drain Valves

Drain Valves

Gas Sampling Valves for Syringes

Gas Sampling Valves for Syringes

Laboratory Valves

Laboratory Valves