The Armstrong Fluid Technology 427714-000 T.C. Shaft is a precision-engineered pump component with a 1-5/8-inch diameter, designed for compatible Armstrong Series 4300 and other specified pump assemblies. It transfers rotational power from the motor to the impeller, enabling efficient fluid circulation throughout the system. Used in commercial and industrial HVAC equipment, including ... https://www.partshnc.com/427714-000-armstrong-fluid-technology-t-c-shaft-1-5-8