{"product_id":"aquatonics-21-inch-o-ring-replacement-for-sta-rite-system-3-heavy-duty-rubber-seal-24850-0008","title":"Aquatonics 21-inch O-Ring Replacement for Sta-Rite System 3 – Heavy-Duty Rubber Seal (24850-0008)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eRenewing a worn O-ring can refresh your pool or spa filtration routine. The Aquatonics 24850-0008 O-ring replacement is designed to fit 21-inch filter tanks from Sta-Rite System 3 families, delivering an airtight seal that resists wear over time. This isn’t just a part replacement; it’s a practical upgrade that supports smooth operation between maintenance windows and backwashing cycles.\u003c\/p\u003e\n\u003ch3\u003eKey benefits that matter\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePerfect fit: precisely designed for 21.2\" inside diameter, 22.36\" outside diameter, and 0.57\" cross section to seat securely in the groove.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty rubber: a flexible yet durable compound that holds up to routine pool use and exposure to chlorine or salt water.\u003c\/li\u003e\n  \u003cli\u003eLeakproof sealing: a tight, consistent seal helps minimize water and air leakage, contributing to steadier filtration performance.\u003c\/li\u003e\n  \u003cli\u003eBroad compatibility: suitable for Sta-Rite System 3 Modular Media SM series and DE cartridge models such as S7D75 and S8D110; replaces part numbers 24850-0008 and related equivalents.\u003c\/li\u003e\n  \u003cli\u003eHassle-free installation: simple to set with a light coat of PTFE-based lubricant around the gasket to help achieve a secure seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReal-world use and expectations\u003c\/h3\u003e\n\u003cp\u003eIn practice, a fresh O-ring can help reduce nuisance leaks during backwashing and support easier routine maintenance. The combination of robust material and precise sizing is designed to endure regular pressure cycles and chemical exposure, helping your filtration system run more consistently.\u003c\/p\u003e\n\u003ch3\u003eCompatibility and part notes\u003c\/h3\u003e\n\u003cp\u003eThis replacement is built to align with 24850-0008 and related part numbers (including APCO2311 and STA-051-2809). If you’re replacing an older gasket, this Aquatonics O-ring offers a tested fit for widely used Sta-Rite and DE cartridge configurations.\u003c\/p\u003e\n\u003ch3\u003eInstallation tips for best results\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eClean the groove and apply a liberal amount of PTFE-based lubricant around the gasket before seating.\u003c\/li\u003e\n  \u003cli\u003eSlide the O-ring into place evenly, avoiding twists or pinches for a uniform seal.\u003c\/li\u003e\n  \u003cli\u003eAfter assembly, run the system and observe for leaks; tighten only as needed to maintain an airtight seal.\u003c\/li\u003e\n\u003c\/ul\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: Which filters and models are compatible with this O-ring?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Designed for 21-inch Sta-Rite System 3 tanks and DE cartridges, including S7D75 and S8D110; replacement for 24850-0008 and related numbers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How should I install the Aquatonics O-ring?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Lubricate the gasket with PTFE-based lubricant, seat evenly in the groove, and reassemble to form an airtight seal.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Aquatonics","offers":[{"title":"Default Title","offer_id":45740976177338,"sku":"B0D6V9TRRD","price":53.07,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/3536\/8890\/files\/aquatonics-21inch-sta-rite-o-ring.jpg?v=1774805283","url":"https:\/\/gardencanada.ca\/products\/aquatonics-21-inch-o-ring-replacement-for-sta-rite-system-3-heavy-duty-rubber-seal-24850-0008","provider":"Garden Canada","version":"1.0","type":"link"}