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
PrincetonCryo | Relief Valve PN 1810032
10512B50 - Apollo Valves 10512B50 - 1/2" MNPT x 1/2" FNPT RVS52 339 LBS/HR Steam Safety Relief Valve (50 psi)
RELIEF VALVE LOW FLOW 50 PSI 1/4 NPT M | Polyconn
Conbraco 10-604-10 | Conbraco 10-604-10 Bronze Pressure Relief Valve, Hot Water, 50 PSI, 3/4" NPT Female | AF Supply