Armstrong Fluid Technology 816304-317K Plastic Impeller 318518-761 Enhanced Safety: Built-in pressure tap

Enhanced Safety: Built-in pressure tap ensures accurate draft-proving switch performance

Using this orifice in a propane system will cause hazardous combustion conditions and soot buildup

but technicians should always verify the wiring diagram on the boiler's control cabinet before installation

Safety Compliance: Restores factory-specified safety parameters to the heating circuit after a primary limit failure

Armstrong Fluid Technology 816304-317K Plastic Impeller 318518-761 Enhanced Safety: Built-in pressure tapThe Armstrong Fluid Technology 816304 317K Plastic Impeller is a precision engineered circulator pump replacement part designed to restore peak hydraulic efficiency to your HVAC system. This 5 1 4" Noryl impeller is manufactured from high quality, non ferrous composite materials, offering superior corrosion resistance and durability in demanding hydronic applications. As the official 816304 317K maintenance kit, it serves as the direct OEM pump