Response to Hi Bill, The PL2626 uses an ultra heavy duty shaft seal made out of a material called Viton. The shaft seal is the most common part which fails on a pool pump and when the shaft seal fails it allows water to get to your motor and eventually ruins the motor. The Viton shaft seal in the PL2626 is great for more demanding pools like salt pools but it is also a good upgrade for standard non salt pools.

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