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The seal seat—also known as the stationary seal—rests inside the pump head and makes a smooth surface that the rotating mechanical seal can ride against, effortlessly ensuring a leak-free seal.

When installing the seal seat you will notice it has a rough side and a smooth side (or a rubber side, in the case of the SQN 20). The smooth side should face against the mechanical seal, allowing it to ride against it and create a smoothly-polished mating surface.

The Seal Seat is part of four pieces that are normally replaced when performing a full Jabsco head rebuild. The other parts are:

If you are only replacing the impeller, it is normally not necessary to replace the seal seat, although it is a good idea to shine a flashlight on it and run your fingernail over it to ensure it is free of any cracks.