Backflow Preventers | McMaster-Carr

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1,000 Products

Fluid Handling

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

26 products

Check Valves

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

744 products

Vacuum Breakers

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

35 products

Sump Pump Backflow-Prevention Valves

Block dirty water from returning to your sump pump

2 products

Flame Arresters

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

8 products

Power Transmission

Air Flow Check Valves

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

21 products

Hydraulic Check Valves

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

78 products

Fastening and Joining

Welding Gas Flashback Arresters

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

24 products

Facility and Grounds Maintenance

Drain Check Valves

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

3 products