This 2-1/2 IN Lead Free Stainless Steel Reduced Pressure Zone Assembly Backflow Preventer Help Stop The Reverse Flow of Liquids Due to Backpressure or Backsiphonage, Where Potential Health Hazard Exists. It Has Osy Groove by Groove Gate Valves That Show if The Valve is Open or Closed And Prevent Stem Corrosion. The Easy Maintenance Assembly Consists of Positive Seated Torsion Spring Check Modules, Bottom Mounted Differential Pressure Relief Valve, Fm/Ul Outside Stem And Yoke Resilient Seated Gate Valves And Top Mounted Test Cocks. The Temperature Range is 33 to 140 Degrees F (0.5 to 60 Degrees C). The Maximum Working Pressure is 175 psi (12.1 Bar). This Backflow Assembly Contains an Integrated Flood Sensor With Sentryplus Alert® Technology to Detect Excessive Water Discharges From The Relief Valve. When Activated Through an Add-On Sensor Connection Kit, The Flood Sensor Relays a Signal That Triggers Notification of Potential Flooding to Service Personnel. The Add-On Sensor Connection Kit is Available For Building Management Systems And Cellular Communication. | Watts | F112062