this is a designated York OEM part

allowing technicians to optimize airflow for both heating and cooling cycles

specifically engineered for seamless integration with PP901 and PP902A

As a direct OEM heating part

ensuring compatibility with most standard thermostats and actuators

Armstrong Fluid Technology 89975001-83702K Seal 321894-708 this is a designated YorkThe Armstrong Fluid Technology 89975001 83702K Seal is a precision engineered silicon carbide mechanical seal designed for high performance fluid handling. This shaft seal replacement is the direct successor to the 89975001 837, offering enhanced durability for abrasive environments. Built to handle abrasive glycol and high temperature water applications, the 89975001 83702K features silicon carbide faces that provide exceptional hardness and wear