Amazon.com: Merrill MFG PRVHDNL75 No Lead Heavy Duty Brass Pressure Relief Valve 75 PSI, Contractor Grade, 3/4" : Industrial & Scientific
H2O PRO 3/4 Inch Male NPT Brass Pressure Relief Valve for Submersible Pump and Pressure Tank Systems, 75 PSI Regulator Valve - Model 148120 - Amazon.com