Watts 994RPDA OSY GPM 4 Part of the 994RPDA Series Basement Window Well chemical solutions chemical solutions UPC 098268587142 50 Minimum Temperature Fahrenheit 33 Outlet Connection Size 4 IN Outlet Connection Type Flanged Joint Outlet Shutoff Valve Type Outside Stem And Yoke Gate Valve Outlet Thread Type Does Not Apply To Product Part Number 0438053 Polymer Coating No Pressure Operation Continuous Protection Type Backpressure and Backsiphonage Series 994RPDA Strainer No Technologies Does Not Apply To Product Tradename None Specification Sheet 994RPDA This 4 inch reduced pressure detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and 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