{"product_id":"hayward-locking-knob-for-star-clear-plus-c900-c1200-hand-tight-replacement-restores-seal","title":"Hayward Locking Knob for Star-Clear Plus C900\/C1200 — Hand-Tight Replacement Restores Seal","description":"\u003cp\u003e\u003cstrong\u003eThe Hayward Locking Knob is a direct replacement knob designed to securely fasten Star-Clear Plus cartridge filters (C900, C1200 and compatible models) for reliable, leak-resistant operation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen a pool filter’s locking assembly becomes worn, stripped or lost, swapping in a compatible replacement knob restores proper clamping force and helps keep the filter cartridge sealed. This replacement part is made to fit Hayward Star-Clear Plus cartridge filters — including models C900 and C1200 — and the separation tank variant, providing a straightforward repair option that avoids costly full-head replacements. The unit weighs approximately 4.3 pounds and installs without specialized tools.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this knob restore filter performance?\u003c\/h3\u003e\n\u003cp\u003eReplacing a damaged or missing knob brings back the correct tension on the filter lid, which helps maintain a proper seal and reduces the chance of leaks or air entering the system. The knob is shaped to provide positive engagement with the locking post so the lid stays firmly seated during pump operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExact fit for Star-Clear Plus locking post geometry\u003c\/li\u003e\n  \u003cli\u003eRestores even clamping pressure around the lid\u003c\/li\u003e\n  \u003cli\u003eHelps prevent bypass and air infiltration into the cartridge\u003c\/li\u003e\n  \u003cli\u003eQuick hand-tight installation — no adhesives required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this knob work with my Hayward cartridge filter?\u003c\/h3\u003e\n\u003cp\u003eThis knob is intended specifically for Hayward Star-Clear Plus cartridge filters, including models C900 and C1200, and the compatible separation tank (CX900G-compatible applications). Confirm your filter model number before ordering to ensure compatibility. If your filter uses a different locking system or brand, this knob may not fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with C900 and C1200 Star-Clear Plus models\u003c\/li\u003e\n  \u003cli\u003eFits the separation tank configuration used with similar Hayward systems\u003c\/li\u003e\n  \u003cli\u003eNot universal — check model stamping on the filter housing\u003c\/li\u003e\n  \u003cli\u003eImages and part numbers help verify compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation and what tools do I need?\u003c\/h3\u003e\n\u003cp\u003eInstallation is designed to be user-friendly. In most cases the knob threads onto the existing locking post and secures by hand; no specialized tools are necessary. If the existing post is damaged, minimal cleaning or replacement of the post may be required for a secure fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHand-tighten knob for normal use\u003c\/li\u003e\n  \u003cli\u003eNo glue or sealant required for standard replacement\u003c\/li\u003e\n  \u003cli\u003eMay require light cleaning of threads prior to installation\u003c\/li\u003e\n  \u003cli\u003eRefer to your filter manual for torque guidance if available\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect for durability and maintenance?\u003c\/h3\u003e\n\u003cp\u003eThe part is intended as a durable service replacement for routine pool maintenance. While not a wear item like a cartridge, it can deteriorate over many seasons from UV exposure, chemical contact or repeated over-tightening. Inspect the knob and locking post periodically and replace if you notice cracking, excessive play, or stripped threads.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable under normal pool chemical conditions\u003c\/li\u003e\n  \u003cli\u003eResistant to routine wear but susceptible to UV aging over years\u003c\/li\u003e\n  \u003cli\u003eReplace if threads are worn or knob cracks\u003c\/li\u003e\n  \u003cli\u003eLight maintenance: rinse and inspect during seasonal cartridge checks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Pool owners, maintenance technicians and DIY-minded consumers who have a Hayward Star-Clear Plus cartridge filter (C900, C1200 or the compatible separation tank configuration) and need a reliable replacement for a worn or missing locking knob. It’s especially useful if you want a simple, low-cost repair that restores proper lid sealing without replacing the entire filter head.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this knob compatible with Hayward C900 and C1200 filters?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This locking knob is made for Hayward Star-Clear Plus C900 and C1200 cartridge filters and compatible separation tank configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need tools to install the replacement knob?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No special tools are required; the knob typically threads on and hand-tightens. Clean the threads if needed before installing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":56799486181716,"sku":"B004UHF9XW","price":74.47,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/hayward-locking-knob-filter-closeup.jpg?v=1786733497","url":"https:\/\/gardenluxe.co.uk\/products\/hayward-locking-knob-for-star-clear-plus-c900-c1200-hand-tight-replacement-restores-seal","provider":"Gardenluxe Uk","version":"1.0","type":"link"}