Non-Return Valves | McMaster-Carr

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1,008 Products

Fluid Handling

Check Valves

Permit flow in only one direction by closing when flow stops or reverses

Backflow-Prevention Valves

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

Vacuum Breakers

Vacuum Breakers

When pressure drops, vents open to prevent suction from drawing liquid back upstream

Sump Pump Backflow-Prevention Valves

Sump Pump Backflow-Prevention Valves

Block dirty water from returning to your sump pump

Flame Arresters

Flame Arresters

Absorb heat from a fire in your gas pipeline to stop it from traveling back to the gas source

Power Transmission

Hydraulic Check Valves

Hydraulic Check Valves

Open to allow hydraulic fluid flow in one direction and close when flow stops or reverses

Air Flow Check Valves

Air Flow Check Valves

Open to allow air flow in one direction and close when flow stops or reverses

Fastening and Joining

Welding Gas Flashback Arresters

Welding Gas Flashback Arresters

Attach to your gas welder to extinguish flames and stop reverse gas flow

Facility and Grounds Maintenance

Drain Check Valves

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

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