Apollo Valve 10-400 Series Bronze Safety Relief Valve, ASME Hot Water, 50 psi Set Pressure, 3/4" NPT Male x Female: Industrial Relief Valves: Amazon.com: Industrial & Scientific
1041710 - Apollo Valves 1041710 - 3/4" MNPT x 3/4" FNPT RVW40 697,000 BTU Bronze Relief Valve (50 psi)