F111621 (Watts) | 3 Inch | SS Reduced Pressure Detector Assembly Backflow Preventer | Osy Shutoff Valves | Cubic Feet Meter | Backflow Flood SensorThis 3 Inch Reduced Pressure Detector Backflow Preventer Assembly Help Stop The Reverse Flow of Liquids Due to Backpressure or Backsiphonage, Where Potential Health Hazard Exists. Extremely Compact And Lighter Than Traditional Designs it is Approved For Horizontal Installation. This Assembly Consists of a Stainless Steel Body With a Quick Access Sleeve, Torsion Spring Check Valves, Resilient Seated Gate Valves With Outside Stem And Yoke, Test Cocks,