Pentair Lock Ring

The Pentair Locking Ring Assembly (part number 59052900Z) is a highly critical safety and securing mechanism engineered specifically for Pentair Clean & Clear, Clean & Clear Predator, Warrior D.E., and PosiClear RP single-cartridge pool and spa filtration systems. Molded from an exceptionally thick, high-impact, and chemical-resistant polymer composite, this circular threaded collar spins securely onto the center flange of the filter tank. Its primary structural role is to lock the upper lid and lower tank body firmly together, compressing the main tank O-ring to establish a bulletproof, watertight seal capable of safely containing intense internal hydraulic pressure. Equipped with an integrated manual lock tab or latch sequence to prevent the ring from backing off or loosening dynamically during pump operation, this robust retaining ring ensures the tank cannot separate under load. This heavy-duty structural closure ring features a broad 12-inch inner diameter and carries a standalone weight of approximately 1.68 pounds (about 1.9 pounds shipping weight), making it a solid, durable component that is easy to grip and thread by hand during routine cartridge maintenance.