Amtrak invented the thermal expansion tank to control pressure build-up in closed, hot water systems. This prevents the water heater pressure relief valve from opening, saves energy and eliminates a potential safety hazard. All thermo-x-troll expansion tank.
Paratech 22-890490 Inline Relief Valve This listing is for (1) unused unit with everything shown in pictures. Overstock unit with NO manufacturer's packagin
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