WATER HEATER RELIEF VALVE - 1/2IN - PRESSURE AND TEMPERATURETemperature Pressure Relief Valve Relief Valve 1 2" Protect your RV water heater from excessive temperatures and water pressure with corrosion resistant temperature and pressure relief valves. All valves are factory set at 150 PSI and are crafted with no gaskets and epoxy coated probes to prevent corrosion buildup. Also Available: *808576 Valve, 3 4"