R604221-01 | Door Switch/Interlock Switch | Armstrong Furnace Product Type_Assembly Vestibule EI Series 2B T&P Valve for Weil-McLain AquaPLUS85/105

T&P Valve for Weil-McLain AquaPLUS85/105 Boilers (633-500-039) Protect your Weil-McLain AquaPLUS85/105 boiler with our replacement T&P relief valve

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R604221-01 | Door Switch/Interlock Switch | Armstrong Furnace Product Type_Assembly Vestibule EI Series 2B T&P Valve for Weil-McLain AquaPLUS85/105Armstrong Furnace Door Switch Interlock Switch (R604221 01) This Armstrong Furnace Door Switch Interlock Switch (R604221 01) is an essential component designed to ensure safety and proper operation of your furnace system. Engineered to meet rigorous standards, it acts as a vital safeguard, preventing the furnace from operating when the access door is open. Specifically engineered for Armstrong furnaces, this switch features a durable construction that