The 1'''' 375ST Reduced Pressure Principle Backflow Assembly offers high hazard protection against both backsiphonage and backpressure of contaminated water into the potable water supply. Materials include engineered plastic construction and quality 300 series stainless steel fasteners, springs, ball valves, and struts. The 375ST is utilized in systems where liquids are corrosive to copper alloys like bronze valves, including medical diagnostic equipment applications, food processing, distilleries, and breweries. It comes standard with full port QT ball valves, and features a maximum working water pressure of 175 psi, maximum working water temperature of 180°F, and hydrostatic test pressure of 350 psi.