Hayward Star-Clear Locking Knob for StarClear Cartridge Filter 50 Sq.Ft. | CX250G

The Hayward Star-Clear Locking Knob (CX250G) is the OEM replacement locking knob for the StarClear cartridge filter, securing the filter lid firmly in place during operation. This locking knob holds the filter lid assembly in its closed position, maintaining a sealed pressure envelope across the filter tank. Replacing a worn, cracked, or stripped knob restores a secure, leak-free lid closure on the filter. Specifications Hayward Part Number CX250G UPC 610377004558 Fits Into Brand Equipment Line Model / Part Number Hayward StarClear Cartridge Filter 50 Sq.Ft. (Open Line) W3C500 Compatibility is based on Hayward 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. Poolaroo Pro Tip When installing the replacement locking knob, hand-tighten only — over-torquing a plastic knob can strip the threads or crack the knob body, leading to the same lid-sealing issue you're solving. Inspect the lid O-ring at the same time; a damaged O-ring will cause leaks regardless of how securely the knob is tightened.