{"product_id":"hayward-cx800g-star-clear-ii-locking-knob","title":"Hayward CX800G Star-Clear II Locking Knob","description":"\u003cp\u003e```html\u003c\/p\u003e\n\u003cstyle\u003e\n  .atb-product-desc,\n  .atb-product-desc * {\n    box-sizing: border-box;\n  }\n\n  .atb-product-desc {\n    --atb-navy: #12374f;\n    --atb-teal: #18a8a2;\n    --atb-teal-dark: #087d80;\n    --atb-orange: #f58232;\n    --atb-light: #f5fbfb;\n    --atb-blue-light: #eaf7fa;\n    --atb-border: #d8e7eb;\n    --atb-text: #263640;\n    --atb-muted: #62737d;\n    max-width: 1120px;\n    margin: 0 auto;\n    color: var(--atb-text);\n    font-family: inherit;\n    line-height: 1.65;\n  }\n\n  .atb-product-desc h2,\n  .atb-product-desc h3,\n  .atb-product-desc h4 {\n    color: var(--atb-navy);\n    line-height: 1.22;\n  }\n\n  .atb-product-desc h2 {\n    font-size: clamp(28px, 4vw, 42px);\n    margin: 0 0 16px;\n    letter-spacing: -0.03em;\n  }\n\n  .atb-product-desc h3 {\n    font-size: clamp(22px, 3vw, 30px);\n   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(max-width: 760px) {\n    .atb-grid {\n      grid-template-columns: 1fr;\n    }\n\n    .atb-hero {\n      border-radius: 18px;\n    }\n\n    .atb-card {\n      padding: 18px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"atb-product-desc\"\u003e\n\u003csection class=\"atb-hero\"\u003e\n\u003cdiv class=\"atb-kicker\"\u003eDiscontinued Hayward Replacement Part\u003c\/div\u003e\n\u003ch2\u003eHayward CX800G Star-Clear II Locking Knob\u003c\/h2\u003e\n\u003cp\u003eThe Hayward CX800G locking knob was used on select Hayward Star-Clear II cartridge filter systems to help secure the filter head or dome to the tank body. This part is now discontinued, so availability is limited to remaining inventory only.\u003c\/p\u003e\n\u003cdiv class=\"atb-badges\"\u003e\n\u003cspan class=\"atb-badge\"\u003eGenuine Hayward Part\u003c\/span\u003e \u003cspan class=\"atb-badge\"\u003ePart Number CX800G\u003c\/span\u003e \u003cspan class=\"atb-badge\"\u003eStar-Clear II Filter Hardware\u003c\/span\u003e \u003cspan class=\"atb-badge\"\u003eDiscontinued Item\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv class=\"atb-alert\"\u003e\n\u003cstrong\u003eDiscontinued Part Notice:\u003c\/strong\u003e Hayward CX800G has been discontinued. This page is solely for product information.\u003c\/div\u003e\n\u003csection class=\"atb-grid\"\u003e\n\u003cdiv class=\"atb-card\"\u003e\n\u003ch3\u003eWhat This Part Is Used For\u003c\/h3\u003e\n\u003cp\u003eThe CX800G locking knob is a replacement fastening component used on compatible Hayward Star-Clear II cartridge filter systems. Its job is to help tighten and secure the filter head assembly during normal pool filtration operation.\u003c\/p\u003e\n\u003cp\u003eA worn, cracked, stripped, or missing knob can prevent the filter from closing correctly and may lead to poor sealing, leaks, or unsafe operation under pressure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atb-card accent\"\u003e\n\u003ch3\u003eWhy Fitment Matters\u003c\/h3\u003e\n\u003cp\u003eOlder Hayward cartridge filters often have model-specific lid, dome, clamp, and knob hardware. Because this part is discontinued, it is especially important to confirm the exact filter model and original part number before purchasing.\u003c\/p\u003e\n\u003cp\u003eDo not assume this knob fits all Hayward cartridge filters. It is intended for compatible Star-Clear II applications only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"atb-card\"\u003e\n\u003ch3\u003eKey Features and Specifications\u003c\/h3\u003e\n\u003cdiv class=\"atb-table-wrap\"\u003e\n\u003ctable class=\"atb-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eHayward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number\u003c\/td\u003e\n\u003ctd\u003eCX800G\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Type\u003c\/td\u003e\n\u003ctd\u003eFilter locking knob\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Product Family\u003c\/td\u003e\n\u003ctd\u003eSelect Hayward Star-Clear II cartridge filter systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eHelps secure the filter head or dome to the tank body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus\u003c\/td\u003e\n\u003ctd\u003eDiscontinued\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"atb-details\"\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eOverview\u003c\/summary\u003e\n\u003cdiv class=\"atb-detail-body\"\u003e\n\u003cp\u003eThe Hayward CX800G Star-Clear II locking knob is a replacement knob used on compatible Hayward Star-Clear II cartridge filter assemblies. This knob helps secure the upper portion of the filter housing so the filter can seal properly during operation.\u003c\/p\u003e\n\u003cp\u003eSince this part is discontinued, it is most commonly purchased for repair of older filter systems where the original knob is damaged, missing, cracked, or no longer tightening correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCompatibility\u003c\/summary\u003e\n\u003cdiv class=\"atb-detail-body\"\u003e\n\u003cp\u003eThis part is intended for compatible Hayward Star-Clear II filter systems that originally used Hayward part number CX800G.\u003c\/p\u003e\n\u003cdiv class=\"atb-fitment-note\"\u003e\n\u003cstrong\u003eFitment reminder:\u003c\/strong\u003e Before ordering, compare your existing knob and filter model label against part number CX800G. Hayward has used different closure hardware across different filter generations, and discontinued parts may not interchange with newer systems.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eInstallation Guidance\u003c\/summary\u003e\n\u003cdiv class=\"atb-detail-body\"\u003e\n\u003cul\u003e\n\u003cli\u003eTurn the pool pump off before servicing the filter.\u003c\/li\u003e\n\u003cli\u003eRelieve all filter pressure before loosening any lid, dome, clamp, or knob hardware.\u003c\/li\u003e\n\u003cli\u003eRemove the old knob and inspect the related filter head, clamp, threads, and sealing surfaces.\u003c\/li\u003e\n\u003cli\u003eInstall the replacement knob only if the surrounding filter hardware is in safe working condition.\u003c\/li\u003e\n\u003cli\u003eTighten evenly and do not over-torque the knob.\u003c\/li\u003e\n\u003cli\u003eRestart the system and inspect carefully for leaks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"atb-muted\"\u003eAlways follow the safety instructions in your filter manual. Pool filters operate under pressure, and damaged closure hardware should be addressed before the system is placed back into service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDiscontinued Item Notes\u003c\/summary\u003e\n\u003cdiv class=\"atb-detail-body\"\u003e\n\u003cp\u003eHayward CX800G is discontinued. That means future availability may be limited, inconsistent, or unavailable once remaining inventory is sold.\u003c\/p\u003e\n\u003cp\u003eIf your filter requires multiple discontinued closure components, or if the tank, lid, clamp, or pressure hardware is damaged, replacing the complete filter may be the safer long-term repair path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCommon Service Context\u003c\/summary\u003e\n\u003cdiv class=\"atb-detail-body\"\u003e\n\u003cp\u003eCustomers typically look for the CX800G locking knob when their original knob is cracked, stripped, difficult to tighten, missing, or no longer holding the filter head securely. On older filters, this can also be a sign that other closure components should be inspected.\u003c\/p\u003e\n\u003cp\u003eIf the filter is leaking after replacement, check the O-ring, lid condition, tank flange, clamp alignment, and overall filter body condition before assuming the new knob is the issue.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShipping and Returns\u003c\/summary\u003e\n\u003cdiv class=\"atb-detail-body\"\u003e\n\u003cp\u003eThis replacement part ships as an individual service component. Please confirm fitment before ordering, especially because this is a discontinued item.\u003c\/p\u003e\n\u003cp\u003eElectrical, gas, pressure vessel, pool filter, and special-order replacement parts may be subject to return restrictions once installed, used, or removed from original packaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"atb-card\"\u003e\n\u003ch3\u003eBefore You Order\u003c\/h3\u003e\n\u003cp\u003eConfirm your filter model, compare the existing knob to part number CX800G, and inspect the rest of the filter closure hardware. If the filter body, lid, clamp, or sealing surface is damaged, replacing only the knob may not solve the problem.\u003c\/p\u003e\n\u003cp\u003eAqua Terra Backyard recommends replacing discontinued pressure-related filter parts only when the rest of the filter assembly is still in safe, serviceable condition.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003cp\u003e```\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":52050071650578,"sku":"CX800G","price":23.37,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/HPPCX800G_0.jpg?v=1771890977","url":"https:\/\/www.aquaterrabackyard.com\/products\/hayward-cx800g-star-clear-ii-locking-knob","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}