This 1 IN lead free anti-siphon, spill resistant, vacuum breaker prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage on indoor point-of-use applications. It consists of an internal polymer coating, bronze body construction, thermoplastic check and float assembly valve, stainless steel springs, tee handles, and a molded diaphragm separating the air inlet from the potable water supply to prevent spillage. It is ideal for indoor use on machines or equipment in general plumbing applications. Maximum working pressure is 150 PSI (10.34 BAR). Minimum working pressure is 8 PSI (55.2 kPa).