Camco Temperature & Pressure Relief Valve - 1/2" Valve with 4" Probe - 10423Camco Temperature & Pressure Relief Valve 1 2 Valve with 4 Probe 10423 Temperature & Pressure Relief Valve 1 2 Valve with 4 Probe Protect your RV water heater from excessive temperatures and water pressure with corrosion resistant metal T&P valves. All valves are factory set at 150 PSI and are crafted with no gaskets and epoxy coated probes to prevent corrosion buildup.