Watts 757 OSY 10 Part of the 757 Series HDPE ductile iron grate with 18 ductile iron grate with 18 square inches of free area and a 3 inch no hub outlet Specifications Body Material Bronze Brand Watts EAN 098268013993 Inlet Connection Size 1 1 2 IN Inlet Connection Type Female Threaded Inlet Thread Type NPT Lead Free NO Maximum Working Pressure PSI 53 Outlet Connection Size 1 1 2 IN Outlet Connection Type Female Threaded Outlet Thread Type NPT Part Number 0276768 Pressure Range 30 to 150 PSI Pressure Relief Setting PSI 70 Series 174A Specification Sheet 174A This 10 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements Features Stainless steel housing and sleeve