This anti-siphon pressure vacuum breaker, 3/4 inch, prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of bronze body construction, plastic check valve seat, silicone rubber check valve disc, stainless steel springs, a bonnet with silicone rubber O-ring seal, a lightweight plastic disc float, test cocks for winterization draining, and tee handle shutoff. It is ideal in health hazard continuous pressure applications such as irrigation systems and industrial process water systems where the water enters the equipment at or below its flood rim. The maximum pressure is 150 PSI (10.3 bar) and the minimum pressure is 15 PSI (55kPa).