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Apollo® valves 17-400 Series pressure only relief valves are engineered to protect against excessive pressure build-up due to thermal expansion in hot water supply systems. Models are CSA certified to ANSI Z21.22 relief valves for hot water supply systems. In addition the 17-402 is design certified to ASME section IV for hot water relief.
Apollo® RVW17-34 Series 17-402-04 Hot Water Relief Valve, 3/4 in Nominal, MNPT x FNPT, Bronze, 250 deg F, 150 psi