Pentair Locking Ring Assembly | Clean & Clear / Predator / POSI-CLEAR RP Filters | 59052900Z

The Pentair Locking Ring Assembly (59052900Z) is the OEM replacement locking ring for the Clean & Clear, Predator, and POSI-CLEAR RP cartridge filter series, as well as the System:2 Modular Media Filter and SEP Separation Tank lines.

The locking ring secures the filter tank head to the body, maintaining a pressure-tight seal during operation. A cracked, warped, or stripped locking ring compromises the tank closure and can result in loss of system pressure or tank separation. Replacing it with the correct OEM assembly restores the mechanical integrity of the filter housing. Match the part number on your existing ring before ordering — this assembly is specific to the filter models listed below.

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

Inspect the locking ring threads and the mating threads on the filter body whenever the tank is opened for cartridge service. Early signs of wear — flattened thread peaks, hairline cracks, or resistance when threading — indicate the ring should be replaced before the next season rather than at failure. While the tank is open, it is also a good time to inspect the tank head O-ring and replace it if it shows any flattening or cracking.