Resideo NK300S Boiler Feed Combination Valve

Resideo’s NK300S Boiler Feed Combination Valve serves as a boiler fill valve used in closed loop heating systems in accordance to ASSE 1081. The NK300S is a (re)filling combination valve that contains an integrated pressure reducing valve, strainer, double check backflow preventer with air vent (to protect potable water supply against back flow of heating water into supply pipe), two shut-off ball valves, pressure gauge, and conveniently located test ports for easy inspections and check out.

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