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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. Both 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® 17 Series 1740203 Safety Relief Pressure Valve, 3/4 in, MNPT x FNPT, 125 psig, Lever Actuator, Bronze