Watts 1/2 In. FPT Back Flow Preventer (9D-M3 1/2)

The 1/2-In. dual check valve backflow preventer with atmospheric vent helps protect potable water supplies by preventing the reverse flow of hot or cold polluted water. Designed for continuous-pressure, non-health hazard applications, it is ideal for boiler feed lines, laboratory equipment, processing tanks, sterilizers, dairy equipment, and other small supply line installations. The durable forged brass body features stainless steel internal components, an integral strainer, and two tight-sealing rubber check valves for reliable performance. Its compact design allows for flexible horizontal or vertical installation.