Anti-Siphon Pressure Vacuum Breakers prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. Designed to stop contaminated water from entering into the potable water supply. Designed for use under continuous pressure. Assembly shall provide protection where a potential health hazard exists. It shall consist of bronze body construction, plastic check valve seat, stainless steel springs, a bonnet with silicone rubber O-ring seal, silicone rubber check valve disc, a lightweight plastic disc float, handles to shutoff water flow to the valve, and test cocks for winterization, draining and testing.