U.S. Seal Mechanical Seal, 5/8″ ID (Generic), PS-4231-OS

This is a generic mechanical shaft seal with a 5/8 inch inside diameter on the ceramic, in the usual carbon and ceramic pairing. It is listed for Jandy Pro Series pumps including the FHPM and the VS FloPro.

Two seals, two shafts

The Stealth impeller was originally made with a different shaft. Revision N and lower had an impeller with a double stepped shaft, and those older pumps need a shaft seal with a 13/16 inch inside diameter on the ceramic. Revision P and higher have no step where the impeller goes onto the motor shaft, and those newer pumps take the 5/8 inch inside diameter ceramic, which is this seal.

Check before you buy

The revision letter and the shaft itself are what decide this, not the pump model on the label. Pull the old seal, measure the bore of the ceramic, and match it. A 13/16 inch version of this seal is available separately for the older shaft.

Generic, not OEM

This is an aftermarket seal built to the same dimensions as the original rather than a factory branded part.