Part Number CX900G: This locking knob replacement kit is specifically designed for Hayward Star Clear Plus Cartridge Filter Models including C900, C9002, C1200, C12002, C12002S, and C751, ensuring a perfect fit and compatibility. Easy Installation Process: Simply remove the knob from your filter and replace it with the CX900G knob. This straightforward process requires no special tools, making it accessible for non-professionals and ensuring a quick and hassle-free installation. Durable Material Construction: Constructed from high-density plasti, the CX900G locking knobs are built to last. This combination of materials enhances the durability and performance of the knobs, providing a reliable solution that withstands frequent use and environmental stress. Compatibility Confirmation: Before purchasing, please verify that your filter model is compatible with the CX900G locking knob. This precaution ensures that you receive a product that fits your needs and avoids the inconvenience of returns due to compatibility issues. Enhanced Product Performance: By using the CX900G locking knob, you not only replace a broken part but also enhance the overall functionality and efficiency of your filtration system. This replacement part is designed to meet or exceed the original equipment specifications, offering improved performance and reliability. Material: Plastic Color: As shown Package Contents: 1 x Locking Knob(CX900G) 1 x Guide Cone(CX900D) 1 x E-Ring(CX900J) 2 x Washer(CX900W) 1 x O-Ring(CX900H) 1 x Directional Vent Valve with O-Ring(ECX1322A) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.