{"product_id":"pentair-drain-cap-thermal-regulator-o-ring-u9-371","title":"Pentair Drain Cap\/Thermal Regulator O-Ring U9-371 – for Filters \u0026 Heaters","description":"\u003cdiv class=\"ups-product-desc\" style=\"max-width:100%;color:#1f2937;line-height:1.7;\"\u003e\n\n\u003c!-- HERO --\u003e\n\u003cdiv style=\"background:linear-gradient(135deg,#0f4c81 0%,#1273b8 100%);color:#fff;border-radius:18px;padding:24px 20px;margin:0 0 24px;\"\u003e\n\u003cdiv style=\"font-size:13px;text-transform:uppercase;opacity:.9;margin-bottom:8px;\"\u003eFilter \u0026amp; Heater Replacement Seal\u003c\/div\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:30px;color:#fff;\"\u003ePentair Drain Cap \/ Thermal Regulator O-Ring\u003c\/h2\u003e\n\u003cp style=\"margin:0;font-size:16px;color:#fff;\"\u003eReplacement O-ring for compatible Pentair MasterTemp and Sta-Rite Max-E-Therm heaters, plus select Waterford and Cristal-Flo filter applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- WARRANTY --\u003e\n\u003cdiv style=\"background:#f8fafc;border:1px solid #e2e8f0;border-radius:14px;padding:16px;margin-bottom:28px;\"\u003e\n\u003ch3 style=\"margin:0 0 8px;font-size:22px;color:#1e3a8a;\"\u003eWarranty Information\u003c\/h3\u003e\n\u003cp style=\"margin:0;font-size:16px;\"\u003e\u003cstrong\u003e1-Year Manufacturer Warranty\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:6px 0 0;font-size:14px;color:#475569;\"\u003eUltimate Pools is your first point of contact for compatibility verification, installation guidance, and warranty support.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- INTRO --\u003e\n\u003cdiv style=\"margin-bottom:28px;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ePentair Drain Cap \/ Thermal Regulator O-Ring (U9-371)\u003c\/strong\u003e is a replacement sealing component used in compatible Pentair and Sta-Rite pool equipment. It is also referenced by former part number \u003cstrong\u003e35505-1313\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is used to help seal supported thermal regulator cap and filter drain cap applications, helping block water from escaping between mating components. \u003cstrong\u003eThis part has been discontinued.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- FEATURES --\u003e\n\u003cdiv style=\"margin-bottom:32px;\"\u003e\n\u003ch3 style=\"font-size:26px;margin:0 0 18px;color:#0f172a;\"\u003eKey Features\u003c\/h3\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;\"\u003e\n\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:16px;\"\u003e\n\u003cstrong\u003eThermal Regulator Cap Seal\u003c\/strong\u003e\u003cbr\u003eUsed as a sealing O-ring in compatible MasterTemp and Max-E-Therm heater applications.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:16px;\"\u003e\n\u003cstrong\u003eFilter Drain Cap Application\u003c\/strong\u003e\u003cbr\u003eAlso specified for compatible Waterford and Cristal-Flo T-BP filter applications.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:16px;\"\u003e\n\u003cstrong\u003eHelps Prevent Leaks\u003c\/strong\u003e\u003cbr\u003eDesigned to block water escape between compatible mating surfaces.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:16px;\"\u003e\n\u003cstrong\u003eMasterTemp Compatibility\u003c\/strong\u003e\u003cbr\u003eFits the listed Pentair MasterTemp heater models.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:16px;\"\u003e\n\u003cstrong\u003eMax-E-Therm Compatibility\u003c\/strong\u003e\u003cbr\u003eFits the listed Sta-Rite Max-E-Therm heater models.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:16px;\"\u003e\n\u003cstrong\u003eDiscontinued Part\u003c\/strong\u003e\u003cbr\u003eU9-371 has been discontinued and was formerly identified as 35505-1313.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- COMPATIBILITY --\u003e\n\u003cdiv style=\"margin-bottom:32px;\"\u003e\n\u003ch3 style=\"font-size:26px;margin:0 0 16px;color:#0f172a;\"\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:18px;\"\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003eCompatible with the following Pentair and Sta-Rite equipment:\u003c\/p\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePentair MasterTemp Heaters:\u003c\/strong\u003e 460792, 460793, 460730, 460731, 460732, 460733, 460734, 460735, 460736, 460737, 460805, 460806\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSta-Rite Max-E-Therm Heaters:\u003c\/strong\u003e SR200NA, SR200HD, SR200LP, SR333NA, SR333HD, SR333LP, SR400NA, SR400HD, SR400LP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterford Systems Sand Filters:\u003c\/strong\u003e Compatible applications using U9-371\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCristal-Flo T-BP High Rate Sand Filters:\u003c\/strong\u003e Compatible applications using U9-371\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin:16px 0 0;font-size:14px;color:#475569;\"\u003eCompatibility may vary by production year, configuration and installation. Verify your exact model and part number before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- APPLICATIONS --\u003e\n\u003cdiv style=\"margin-bottom:32px;\"\u003e\n\u003ch3 style=\"font-size:26px;margin:0 0 16px;color:#0f172a;\"\u003eApplications\u003c\/h3\u003e\n\u003cdiv style=\"background:#f8fafc;border:1px solid #dbeafe;border-radius:14px;padding:18px;\"\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003eThermal regulator cap sealing on compatible heaters\u003c\/li\u003e\n\u003cli\u003eDrain cap sealing on compatible filters\u003c\/li\u003e\n\u003cli\u003eReplacement of a worn or damaged O-ring\u003c\/li\u003e\n\u003cli\u003eMasterTemp heater servicing\u003c\/li\u003e\n\u003cli\u003eMax-E-Therm heater servicing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin:16px 0 0;font-size:14px;color:#475569;\"\u003eBecause this part has been discontinued, verify the exact application and part number before ordering or sourcing a replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- SPECIFICATIONS --\u003e\n\u003cdiv style=\"margin-bottom:28px;\"\u003e\n\u003ch3 style=\"font-size:26px;margin:0 0 16px;color:#0f172a;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;border:1px solid #e5e7eb;border-radius:14px;\"\u003e\n\u003ctable style=\"width:100%;min-width:520px;border-collapse:collapse;\"\u003e\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003eU9-371\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eFormer Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e35505-1313\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003ePentair \/ Sta-Rite\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003eO-Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003eThermal regulator cap and filter drain cap sealing\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003eListed Pentair MasterTemp and Sta-Rite Max-E-Therm heaters; compatible Waterford Systems and Cristal-Flo T-BP sand filter applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eStatus\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003eDiscontinued\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #e5e7eb;\"\u003e1-Year Manufacturer Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"padding:12px;\"\u003e\u003cstrong\u003eFinal Sale\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- FAQ --\u003e\n\u003cdiv\u003e\n\u003ch3 style=\"font-size:26px;margin:0 0 16px;color:#0f172a;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"background:#fff;border:1px solid #e5e7eb;border-radius:14px;overflow:hidden;\"\u003e\n\n\u003cdiv style=\"padding:16px;border-bottom:1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003eWhat is the Pentair U9-371 used for?\u003c\/strong\u003e\u003cbr\u003eIt is used as an O-ring seal in compatible thermal regulator cap and filter drain cap applications.\n\u003c\/div\u003e\n\n\u003cdiv style=\"padding:16px;border-bottom:1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003eDoes U9-371 fit Pentair MasterTemp heaters?\u003c\/strong\u003e\u003cbr\u003eYes. It is compatible with the listed MasterTemp heater models.\n\u003c\/div\u003e\n\n\u003cdiv style=\"padding:16px;border-bottom:1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003eDoes it fit Sta-Rite Max-E-Therm heaters?\u003c\/strong\u003e\u003cbr\u003eYes. It is listed for the specified SR200, SR333 and SR400 Max-E-Therm heater models.\n\u003c\/div\u003e\n\n\u003cdiv style=\"padding:16px;border-bottom:1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003eWhat was the previous part number?\u003c\/strong\u003e\u003cbr\u003eU9-371 was formerly identified as part number 35505-1313.\n\u003c\/div\u003e\n\n\u003cdiv style=\"padding:16px;\"\u003e\n\u003cstrong\u003eHas the U9-371 been discontinued?\u003c\/strong\u003e\u003cbr\u003eYes. The supplied product information identifies this part as discontinued. It is also final sale.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":43147590500521,"sku":"U9-371","price":5.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2647\/4409\/files\/U9-371.png?v=1689713536","url":"https:\/\/ultimatepools.ca\/products\/pentair-drain-cap-thermal-regulator-o-ring-u9-371","provider":"ultimatepools.ca","version":"1.0","type":"link"}