Brass Check Valves | McMaster-Carr

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228 Products

About Backflow-Prevention Valves

Threaded Check Valves

For use with threaded pipe, these valves are available with NPT, NPTF, BSPP, BSPT, and UNI/UNF (JIC) connections.

Compact Threaded Check Valves

With a shorter end-to-end length than other check valves, these fit in tight spaces.

High-Pressure Threaded Check Valves

Rated for up to twice the pressure of standard check valves, these can withstand pressures up to 3,000 psi.

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings.

Check Valves with Push-to-Connect Fittings

Insert tubing into the fitting—no heat, solder, or flux required.

Heavy Duty Threaded Check
Valves for Drinking Water

For more durability than plastic, these valves have a metal body.

Heavy Duty Check Valves with
Push-to-Connect Fittings for Drinking Water

The metal body is more durable than plastic.

Check Valves with Solder-Connect
Fittings for Drinking Water

Solder to copper tubing for a permanent, leak-tight connection.

Threaded Check Valves for Oil and Fuel

High-Pressure Threaded
Check Valves for Oil and Fuel

Rated for at least four times the pressure of standard check valves for oil and fuel, these are often used in hydraulic applications with pressures up to 3,000 psi.

Threaded Two-Stage Backflow-Prevention Valves

Attach these valves with NPT connections to threaded pipe.

Two-Stage Backflow-Prevention
Valves with Solder-Connect Fittings

Solder these valves to copper tubing for a permanent, leak-tight connection.

Threaded Two-Stage Backflow-Prevention
Valves for Drinking Water

Vacuum-Breaking Valves

Commonly used with irrigation systems and laboratory equipment, these valves have NPT connections.

Vacuum-Breaking Valves with Garden-Hose Fittings

Prevent dirty, contaminated water from backing up into your garden hose line—install these valves between a faucet and a garden hose.

Electric-, Air-, and Hydraulic-Powered Motion Control

Backflow-Prevention Inline Hydraulic Valves

Also known as check valves, these open to allow flow in one direction and close when flow stops or reverses.

Air Flow Check Valves

These valves open to allow flow in one direction and close when flow stops or reverses direction.

Air Compressor Air Flow Check Valves

Prevent air from escaping an air storage tank when the air compressor is not running. These valves open to allow flow into the tank and close when flow stops or reverses direction.

Oxyacetylene Welding and Cutting

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator.

Welding Gas Check Valves for Torches

Stop the reverse flow of gas in your torch.

Welding Gas Flashback Arresters for Regulators

Attach these arresters to the outlet connection of a regulator on a torch that cuts steel up to 11" thick.

Welding Gas Flashback Arresters for Torches

These arresters attach directly to torches that cut steel up to 8" thick.

Frostproof Vacuum-Breaking Valves with Garden Hose Threads

Frostproof Vacuum-Breaking
Valves with Garden Hose Threads

Stop backward flow in outdoor faucets with garden hose thread (GHT) outlets.