Pentair Mechanical Shaft Seal, Ozone/Salt Resistant | SuperMax, SuperFlo, Challenger, IntelliFlo3 | 356210S

The Pentair Mechanical Seal (356210S) is the OEM replacement shaft seal for Pentair SuperMax, SuperFlo, Challenger, and IntelliFlo3/IntelliPro3 pump lines — specifically formulated with ozone and salt resistant materials for pools running salt chlorine generators or ozone sanitation systems.

The mechanical seal sits between the pump's wet end and motor, creating a watertight barrier around the rotating shaft. When this seal wears or degrades, water migrates toward the motor bearing cavity — leading to bearing failure and motor damage. Replacing the seal at the first sign of leakage behind the pump protects the motor and avoids a significantly more expensive repair. This 356210S is listed as an alternate seal to 354545S on the SuperMax platform — confirm which seal is currently installed before ordering.

Specifications

Fits Into

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.

Pro Tip

The 356210S is listed as an alternate to 354545S on SuperMax pumps — both are valid seals for that platform, but they are not identical. Before ordering, check the part number printed on your existing seal or confirm against your pump's parts diagram. When the pump is already open for a seal replacement, it's also the right time to inspect the pump lid O-ring and volute gasket — replacing worn secondary seals in the same service visit prevents a follow-up leak call.