This 2-1/2 IN Lead Free Stainless Steel Double Check Valve Backflow Preventer Assembly Has Osy Groove by Groove Gate Valves That Show if The Valve is Open or Closed And Prevent Stem Corrosion. Ideally Suited For Referenced Cross-Connections Identified as Non-Health Hazard Continuous Pressure Applications, it Prevents The Backflow of Contaminated Water Into The Potable Water Supply And Protects Against Backsiphonage And Backpressure. The Easy Maintenance Assembly Consists of Positive Seated Thermoplastic Independently Operating Torsion Spring Check Modules, Ul/Fm 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). | Ames-Deringer | 0112098