STAINLESS STEEL 3/4" 75 psi PRESSURE RELIEF VALVE for WATER WELL Pump Pressure tank RELIEF VALVE - 3/4" Stainless Steel Pressure relief valve. FOR USE WITH TANK TEE - 3/4" MPT that screws into tank tee. LINE TO DRAIN - 1/2" port for running a line to the drain, outdoors. 75 PSI - Set at 75 PSI, 15% setting accuracy, field adjustments are not recommended. FOR COLD WATER SYSTEM - Recommended for all cold water system installations - to protect against damage to piping and pressure tanks.