Pressure Relief Valve - 75 PSIWater Heater Pressure Relief valve. Water heater temperature and pressure relief valves, or T&P valves, are a safety feature found on all tank water heaters. It's designed to open temporarily and discharge short spurts of water when the temperature exceeds about 210 degrees F, and it releases pressure if the tank gets above 75 psi.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. - cis2:mm5mnJlm -Specifications: Type: Parts; Box Dimensions: 2"H x 3"W x 6"L WT: 0.55 lbs; UPC: 098268583076;