Compatible with StarClear Plus Cartridge Filters C751, C900, C1200, C1750, and C1900. Part Model: CX900DA Knob Replacement Kit. Key Benefits: Designed to restore and maintain proper sealing on StarClear Plus pool filters, eliminating leaks from the of the filter housing. Guides the filter lid securely onto the threaded rod, ensuring all components are aligned and held firmly in place. Improves filter performance and makes routine cleaning quicker and easier by preventing water loss and pressure issues. Function and Performance: Ideal solution for stripped or worn filter knobs where the original cone is missing or damaged. Helps maintain filter pressure, reducing strain on the pump and extending equipment lifespan. Provides a precise fit to the specified StarClear Plus models for reliable operation. Ease of Installation: Fast and straightforward to install with basic tools. For filters with corrosion in the groove area, prefitting the Ering onto the knob and rotating it to movement before final assembly is recommended for smoother installation. Durable Construction: Manufactured to match OEM quality standards, ensuring dependable performance and compatibility. Use Scenarios: 1. Residential pool owners replacing a worn knob to stop leaks and restore efficient cleaning cycles. 2. Commercial pool maintenance teams servicing StarClear Plus filters to maintain clear water for guests and patrons. 3. Technicians performing routine filter overhauls and ensuring fitment of replacement components for longterm water clarity. This CX900DA Knob Replacement Kit is purposebuilt to bring your StarClear Plus filter system back to peak performance, protect against leaks, and ensure consistent filtration results without the hassle of frequent repairs.