Armstrong Fluid Technology 816303-317K Impeller Kit 318973-401 the 258860 provides a direct-fit

the 258860 provides a direct-fit solution that eliminates field modification guesswork

Airtight Performance: Prevents HVAC air leaks and maintains critical system pressure for peak efficiency

Multi-Refrigerant Compatibility: Rated for use with A1 and A2L refrigerants

By keeping the crankcase temperature above the system's dew point

Using it on lower BTU models will result in over-firing and potential manifold failure

Armstrong Fluid Technology 816303-317K Impeller Kit 318973-401 the 258860 provides a direct-fitThe Armstrong Fluid Technology 816303 317K Impeller Kit is a precision engineered OEM replacement part designed to restore the hydraulic efficiency of high performance circulator pumps. This comprehensive kit features a 5. 25 inch Noryl impeller, a high strength thermoplastic known for its exceptional dimensional stability and resistance to corrosion and scaling in demanding HVACR systems. By utilizing an injection molded replacement impeller kit,