NSF/ANSI-Standard Check Valves | McMaster-Carr

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112 Products

About Backflow-Prevention Valves

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Backflow-Prevention Valves

Easy-to-Install Threaded Check
Valves for Harsh Chemicals

To reduce installation time and allow for maintenance without detaching pipe connections, these valves have union fittings.

Threaded Check Valves for Harsh Chemicals

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

Threaded Check Valves for Drinking Water

Body is plastic.

Heavy Duty Threaded Check
Valves for Drinking Water

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

Socket-Connect Check Valves for Drinking Water

Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection.

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

Valves have a plastic body.

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

The metal body is more durable than plastic.

Flange-Mount Check Valves for Drinking Water

Flange-Mount Check Valves for Drinking Water

Sandwich these valves between ANSI flanges.

Check Valves with Solder-Connect
Fittings for Drinking Water

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

Threaded Two-Stage Backflow-Prevention
Valves for Drinking Water

Easy-Maintenance Threaded Two-Stage
Backflow-Prevention Valves for Drinking Water

Integral shutoff valves isolate flow for inline maintenance, and a top-entry cover provides easy access to internal components.

Vacuum-Breaking Valves with Garden-Hose Fittings

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.

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)