Watts 957RPDA OSY CFM FS 4 Part of the 957RPDA Series silt fence selector This lead free double check This lead free double check valve assembly backflow preventer For quick repairs Specifications ArmorTek Technology No Backflow Preventer Type Reduced Pressure Detector Assembly Body Finish Stainless Steel Body Material Stainless Steel Body Pattern Straight Brand Watts Bypass Yes Bypass Size 3 4 IN Cap And Tether No Disc Material Silicone EAN 098268503807 Elbow Fitting No Hazard Protection Level Health Hazard Hot And Harsh Water No Hydrant Connection No Inlet Connection Size 4 IN Inlet Connection Size Metric 100 MM Inlet Connection Type Grooved Joint Inlet Shutoff Valve Type Outside Stem And Yoke Gate Valve Inlet Thread Type Does Not Apply To Product Lead Free No Maximum Temperature Fahrenheit 140 Maximum Working Pressure BAR 12 This 4 inch reduced pressure detector backflow preventer assembly help stop the reverse flow of liquids due to backpressure or backsiphonage