CX900G Locking Knobs for Star Clear Plus Cartridge Filters Compatible Models: Designed for Star Clear Plus cartridge filters and separator canister models C900, C9002, C1200, C12002, C12002S, and C751. Key Benefits: Ensures a secure connection between the filter tank and bottom to maintain a tight seal and prevent leaks. Maintains filtration system performance by preventing water bypass and pressure loss. Precise fit based on original manufacturer specifications for consistent reliability. Function and Performance: Each locking knob firmly fastens the filter tank components together during operation, reducing the risk of leaks and maintaining stable water flow. Reliable sealing helps protect pump efficiency and prolongs filter life. Material Quality: Manufactured with density plastic and brass for strength, durability, and longlasting performance, even in outdoor pool environments. Ease of Installation: No tools required. Simply remove the worn or damaged knob and it with the CX900G knob. Direct replacement design ensures quick installation. Practical Use Scenarios: 1. Ideal for replacing cracked or worn knobs on pool filters to restore safe, leak operation. 2. Useful for seasonal pool maintenance when reassembling filter tanks after cleaning. 3. Convenient for service professionals performing routine filter part replacements on compatible Star Clear Plus models. Dimensions and Fit: Engineered to match the original size and threading of the specified models, ensuring a secure fit without modification. This CX900G locking knob offers a durable, simple solution to maintain your pool filter's secure seal and efficiency.