Pentair Baffle and Bulkhead Fitting | System 3 Modular Media Filter | 25021-0101Z

Description

The Pentair Baffle and Bulkhead Fitting (25021-0101Z) is the OEM replacement fitting for the Sta-Rite System 3 Modular Media Filter series, restoring proper internal flow separation and tank integrity when the original component is damaged or worn.

This fitting serves a dual function within the System 3 filter tank: the baffle directs water flow through the filter media in the correct sequence, while the integrated bulkhead provides a sealed passage through the tank wall. When either function is compromised — through cracking, warping, or seal failure — filtration efficiency drops and water can bypass the media entirely. Replacing this component with the correct OEM part restores the designed flow path and tank seal.

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 System 3 filter family spans multiple tank sizes — confirm your model number (S7M120, S7M400, S8M150, or S8M500) against the label on your filter tank before ordering. The baffle and bulkhead fitting is sized to the tank, and installing a fitting from a different tank configuration will result in an improper seal. When the filter is open for this service, inspect the internal manifold O-rings at the same time — replacing worn seals in a single service visit prevents a second teardown.