WATTS® Reduced Pressure Zone Assembly, Lead Free, Series: 957, 3 in Nominal Size, Grooved, 175 psi, 33 to 140 deg F, 304 Stainless Steel Body, 31-3/4 in L
Series 957, 957N, 957Z Reduced Pressure Zone Assemblies prevent the reverse flow of polluted water from entering into the potable water supply due to back siphonage and or backpressure. It consists of stainless steel body, sleeve and torsion spring check valves. Series 957, 957N, 957Z has a compact design that is 70% lighter than traditional designs, and is ideal for health hazard piping applications for protection against back siphonage or backpressure. Check with local water authorities for installation requirements. Maximum Working Pressure: 175psi.