Watts LF800M4-QT 3/4" Lead Free Vacuum Breaker

Watts 800M4-QT 3/4 inch lead free anti-siphon pressure vacuum breaker backflow preventer prevents the reverse flow of polluted water from entering into the potable water supply. The assembly has a bronze body construction, silicone rubber check valve disc, plastic check valve seat, stainless steel springs, a bonnet with silicone rubber O-ring seal, a lightweight plastic disc float, a built-in relief valve to protect the internal components and the body from freezing, lever handle shutoffs, and test cocks.