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The 375ST Reduced Pressure Principle Backflow Preventer 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.

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Complete Pressure Vessel Repair Kit, 1/2" and 3/4" 375ST used with RK34-375VST. Kit Contains O-Ring, #1 Check Seat, #1 Check Seat, Poppet Screw (x2), Check Seal Retainer (x2), Check Seal Ring (x2), Poppet (x2), #1 Check Spring, #1 Check Spring Retainer, O-Ring, #2 Check Seat, #2 Check Seat, #2 Check Spring, #2 Check Spring Retainer, O-Ring, Housing Inlet, Test Cock, SS (x3), Check Housing, O-Ring, Housing Outlet, O-Ring, Relief Valve Cover, O-Ring, Relief Valve Seat, Relief Valve Seat, Relief Valve Spring, Relief Valve Seal Retaining Screw, Relief Valve Seal Ring, Relief Valve Lower Plunger, Diaphragm, Relief Valve Upper Plunger, O-Ring, Relief Valve Stem, Relief Valve Cover, Relief Valve Cover Screw, Short (x2), Relief Valve Cover Screw, Long (x4), and Test Cock Cap Plug (x3).