{"product_id":"pentek-r51120-241-epdm-o-ring-dura-series-housings","title":"Pentek #241 EPDM O-Ring for Dura-Series Standard Filter Housings (R51120)","description":"\u003clink href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Serif+Display:ital@0;1\u0026amp;family=DM+Sans:wght@300;400;500;600\u0026amp;display=swap\" rel=\"stylesheet\"\u003e\u003cstyle\u003e.ro-wrap{--deep:#0a1628;--ocean:#0f3460;--blue:#1565c0;--sky:#2196f3;--aqua:#4dd0e1;--white:#ffffff;--offwhite:#f2f7fc;--slate:#dce8f5;--text:#0d1f38;--muted:#4a6280;--gold:#f59e0b;--radius:12px;font-family:'DM Sans',sans-serif;color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-wrap:break-word;word-break:break-word;min-width:0}.ro-wrap .ro-hero{background:linear-gradient(135deg,var(--deep) 0%,var(--ocean) 50%,#1a5276 100%);color:var(--white);padding:52px 40px 44px;position:relative;overflow:hidden;border-radius:var(--radius) var(--radius) 0 0}.ro-wrap 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.ro-feature-grid,.ro-wrap .spec-cards,.ro-wrap .kit-list{grid-template-columns:1fr}.ro-wrap .benefits-strip{flex-direction:column}.ro-wrap .benefit-item{border-right:none;border-bottom:1px solid rgba(255,255,255,.1)}}\u003c\/style\u003e\u003cdiv class=\"ro-wrap\"\u003e\n\u003cdiv class=\"ro-hero\"\u003e\n\u003cdiv class=\"ro-eyebrow\"\u003ePentek Dura-Series · Replacement Part\u003c\/div\u003e\n\u003ch2\u003e#241 EPDM O-Ring \u003cem\u003efor Dura-Series Housings\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cdiv class=\"ro-tagline\"\u003eFactory replacement seal for the radial O-ring groove on 10\" and 20\" Dura-Series standard housings\u003c\/div\u003e\n\u003cdiv class=\"ro-badges\"\u003e\n\u003cspan class=\"ro-badge\"\u003e#241 Size\u003c\/span\u003e\u003cspan class=\"ro-badge\"\u003eEPDM\u003c\/span\u003e\u003cspan class=\"ro-badge\"\u003ePart R51120\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ro-callout lead\"\u003e\u003cp\u003e\u003cstrong\u003eLead time:\u003c\/strong\u003e Expected restock date is \u003cstrong\u003eNovember 12, 2026\u003c\/strong\u003e. Order now and we ship as soon as stock lands.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"ro-callout\"\u003e\u003cp\u003eThe Dura-Series seals radially — the O-ring sits on the side of the sump rather than on top — so Pentair specifies this \u003cstrong\u003eEPDM\u003c\/strong\u003e ring (R51120) for it. It is the same #241 dash size as the Buna-N 151120 used on legacy standard housings. Keep one on hand and replace it whenever you see nicks, flattening or weeping at the cap.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"ro-section\"\u003e\n\u003cdiv class=\"ro-label\"\u003eSPECIFICATIONS\u003c\/div\u003e\n\u003ch3 class=\"ro-title\"\u003eSize and material\u003c\/h3\u003e\n\u003ctable class=\"specs-table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDash Size\u003c\/td\u003e\n\u003ctd\u003e#241\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInside Diameter\u003c\/td\u003e\n\u003ctd\u003e3.86\" (98 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside Diameter\u003c\/td\u003e\n\u003ctd\u003e4.14\" (105 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross Section\u003c\/td\u003e\n\u003ctd\u003e0.14\" (3.5 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eEPDM, FDA grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits\u003c\/td\u003e\n\u003ctd\u003ePentek Dura-Series 10\" and 20\" standard housings (R50067–R50072, R51001, R51046, R52018, R52047)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold\u003c\/td\u003e\n\u003ctd\u003eEach\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"pro-tip\"\u003e\n\u003cspan class=\"pro-tip-icon\"\u003e💡\u003c\/span\u003e\u003cp\u003e\u003cstrong\u003eLubricate before installing.\u003c\/strong\u003e Coat the entire ring with silicone grease (never petroleum) before seating it in the groove — a dry EPDM ring can roll or pinch and weep at the cap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"benefits-strip\"\u003e\n\u003cdiv class=\"benefit-item\"\u003e\n\u003cdiv class=\"bi-icon\"\u003e🚚\u003c\/div\u003e\n\u003ch4\u003eShips from California\u003c\/h4\u003e\n\u003cp\u003ePacked and shipped from our Santa Ana warehouse\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"benefit-item\"\u003e\n\u003cdiv class=\"bi-icon\"\u003e✅\u003c\/div\u003e\n\u003ch4\u003eGenuine Pentek\u003c\/h4\u003e\n\u003cp\u003eAuthentic Pentair Dura-Series product with the Pentair symbol molded inside the cap\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"benefit-item\"\u003e\n\u003cdiv class=\"bi-icon\"\u003e🛠️\u003c\/div\u003e\n\u003ch4\u003eBuild Help\u003c\/h4\u003e\n\u003cp\u003eNot sure what fits? Call (877) 541-6603 and we'll match the right housing, cartridge and hardware\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Pentek","offers":[{"title":"Restock Nov 12","offer_id":48344759599275,"sku":"R51120","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0446\/7677\/6098\/files\/pentair-r51120-main-image.jpg?v=1792700344","url":"https:\/\/www.isopurewater.com\/products\/pentek-r51120-241-epdm-o-ring-dura-series-housings","provider":"Isopure Water","version":"1.0","type":"link"}