Watts 909RPDA LF GPM 4 Part of the 909RPDA Series chat hdpe Modular design with interlocking channel Modular design with interlocking channel sections and installation aids (e Engineered for high flow: 100 GPM rating in code compliant installations 50 Minimum Temperature Fahrenheit 33 Outlet Connection Size 4 IN Outlet Connection Type Mechanical Joint Outlet Shutoff Valve Type No Shutoff Valve Part Number 0387209 Polymer Coating No Pressure Operation Continuous Protection Type Backpressure and Backsiphonage Seat Material Bronze Series 909RPDA Strainer No Technologies Does Not Apply To Product Tradename None Specification Sheet 909RPDA This 4 inch reduced pressure detector backflow preventer assembly with its exclusive design incorporating the patented air in and water out principle for protection from the reverse flow of fire protection system substances from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure