{"product_id":"1-375xl-1in-rpz-composite-vessel-fnpt-lf","title":"Zurn Wilkins 375XL 1-inch Reduced-Pressure Backflow Preventer - 1-375XL","description":"\u003ch2\u003eZurn Wilkins 375XL 1-inch Reduced-Pressure Backflow Preventer - 1-375XL\u003c\/h2\u003e\n\u003cp\u003eThe Wilkins 375XL 1-inch Reduced Pressure Principle (RPZ) backflow preventer delivers high-hazard protection for potable water systems. Designed for ease of service, the assembly features a removable EZSwap pressure vessel, FNPT end connections, and quarter-turn ball valves that simplify installation, flushing, and testing.\u003c\/p\u003e\n\u003cp\u003eBuilt for commercial, irrigation, and municipal applications, the 375XL balances serviceability and long-term performance. Optional blow-out\/flush fittings and readily available repair kits simplify field maintenance and winterization. See the specification sheet and installation manual for complete dimensions, weight, and installation instructions.\u003c\/p\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eNominal size: 1-inch (FNPT end style) with full-port flow to minimize pressure loss.\u003c\/li\u003e\n\u003cli\u003eDurable EZSwap reinforced-nylon composite pressure vessel — removable for fast flushing and testing.\u003c\/li\u003e\n\u003cli\u003eLead-free construction (ANSI\/NSF 372 compliant) with minimal bronze components to deter theft.\u003c\/li\u003e\n\u003cli\u003ePerformance: 175 psi working pressure, 180°F maximum temperature, and 350 psi hydrostatic test pressure.\u003c\/li\u003e\n\u003cli\u003eCertifications and listings include ASSE 1013, cUL\/IAPMO, and AWWA compatibility for potable water systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eWhat our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"1wy6iwh\" data-start=\"213\" data-end=\"422\"\u003e\n\u003cstrong data-start=\"215\" data-end=\"246\"\u003eMaximum backflow protection\u003c\/strong\u003e: RPZ (Reduced Pressure Zone) design provides one of the highest levels of cross-connection safety available for drinking water systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1jt09as\" data-start=\"423\" data-end=\"628\"\u003e\n\u003cstrong data-start=\"425\" data-end=\"465\"\u003eServiceable modular cartridge system\u003c\/strong\u003e: Internal check and relief components are designed for fast removal and replacement, reducing downtime during maintenance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"5x4u4b\" data-start=\"629\" data-end=\"789\"\u003e\n\u003cstrong data-start=\"631\" data-end=\"669\"\u003eLead-free, potable-water compliant\u003c\/strong\u003e: Built for safe use in municipal, residential, and commercial plumbing systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1p5i252\" data-start=\"790\" data-end=\"954\"\u003e\n\u003cstrong data-start=\"792\" data-end=\"825\"\u003eWinterization-friendly design\u003c\/strong\u003e: Cartridge can be removed to help prevent freeze damage and simplify seasonal servicing. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"bruqth\" data-start=\"955\" data-end=\"1141\"\u003e\n\u003cstrong data-start=\"957\" data-end=\"981\"\u003eDurable construction\u003c\/strong\u003e: Heavy-duty bronze body and engineered internal assembly designed for long-term performance under demanding conditions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1t4qke3\" data-start=\"1142\" data-end=\"1313\"\u003e\n\u003cstrong data-start=\"1144\" data-end=\"1173\"\u003eCode-approved reliability\u003c\/strong\u003e: Meets major certifications including ASSE 1013 and NSF\/ANSI standards for backflow prevention use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\n\u003cbr\u003eQ\u0026amp;A\u003c\/h5\u003e\n\u003cp data-start=\"0\" data-end=\"222\"\u003e\u003cstrong data-start=\"0\" data-end=\"54\"\u003eQ: What is the Zurn Wilkins 375XL 1-inch used for?\u003c\/strong\u003e\u003cbr data-start=\"54\" data-end=\"57\"\u003eA: A reduced-pressure zone (RPZ) backflow preventer designed to protect potable water systems from high-hazard contamination caused by backpressure or backsiphonage.\u003c\/p\u003e\n\u003cp data-start=\"224\" data-end=\"414\"\u003e\u003cstrong data-start=\"224\" data-end=\"262\"\u003eQ: Does it protect drinking water?\u003c\/strong\u003e\u003cbr data-start=\"262\" data-end=\"265\"\u003eA: Yes. It is lead-free and certified for potable water applications under NSF\/ANSI 61 and ASSE 1013 standards. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"416\" data-end=\"634\"\u003e\u003cstrong data-start=\"416\" data-end=\"488\"\u003eQ: What makes the 375XL different from standard backflow preventers?\u003c\/strong\u003e\u003cbr data-start=\"488\" data-end=\"491\"\u003eA: It provides high-level protection using a dual-check + relief valve system that safely discharges water if unsafe pressure conditions occur.\u003c\/p\u003e\n\u003cp data-start=\"636\" data-end=\"808\"\u003e\u003cstrong data-start=\"636\" data-end=\"687\"\u003eQ: What size and connection type is this model?\u003c\/strong\u003e\u003cbr data-start=\"687\" data-end=\"690\"\u003eA: 1-inch FNPT threaded connections, commonly used in residential and light commercial plumbing or irrigation systems.\u003c\/p\u003e\n\u003cp data-start=\"810\" data-end=\"1001\"\u003e\u003cstrong data-start=\"810\" data-end=\"840\"\u003eQ: Is it easy to maintain?\u003c\/strong\u003e\u003cbr data-start=\"840\" data-end=\"843\"\u003eA: Yes. It features a removable cartridge\/EZSwap-style design that allows faster inspection, testing, and winterization. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1003\" data-end=\"1188\"\u003e\u003cstrong data-start=\"1003\" data-end=\"1041\"\u003eQ: What materials is it made from?\u003c\/strong\u003e\u003cbr data-start=\"1041\" data-end=\"1044\"\u003eA: Lead-free bronze body with corrosion-resistant internal components designed for long service life in outdoor and buried utility environments.\u003c\/p\u003e\n\u003cp data-start=\"1190\" data-end=\"1344\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1190\" data-end=\"1228\"\u003eQ: Where is it commonly installed?\u003c\/strong\u003e\u003cbr data-start=\"1228\" data-end=\"1231\"\u003eA: Irrigation systems, fire protection lines, and any application requiring high-hazard cross-connection control.\u003c\/p\u003e\n\u003ch5\u003e\n\u003cbr\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-WEB:15d07b9e-85e9-40b7-b286-42d6f6f630d0-12\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:15d07b9e-85e9-40b7-b286-42d6f6f630d0-12\" data-turn-id-container=\"request-WEB:15d07b9e-85e9-40b7-b286-42d6f6f630d0-12\" data-testid=\"conversation-turn-24\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-3 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"db97b809-7f3a-4e42-904a-4a2da2cc7055\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cul data-start=\"79\" data-end=\"828\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"18cza8k\" data-start=\"79\" data-end=\"184\"\u003eSchedule \u003cstrong data-start=\"90\" data-end=\"118\"\u003eannual certified testing\u003c\/strong\u003e to ensure proper backflow protection and regulatory compliance.\u003c\/li\u003e\n\u003cli data-section-id=\"16b2fn9\" data-start=\"185\" data-end=\"300\"\u003eInspect regularly for \u003cstrong data-start=\"209\" data-end=\"257\"\u003eleaks, relief valve discharge, and corrosion\u003c\/strong\u003e, especially after pressure fluctuations.\u003c\/li\u003e\n\u003cli data-section-id=\"1ogginl\" data-start=\"301\" data-end=\"405\"\u003eKeep \u003cstrong data-start=\"308\" data-end=\"369\"\u003eshutoff valves, test cocks, and internal components clean\u003c\/strong\u003e to prevent debris-related issues.\u003c\/li\u003e\n\u003cli data-section-id=\"afrmcs\" data-start=\"406\" data-end=\"505\"\u003eFlush the assembly periodically to reduce \u003cstrong data-start=\"450\" data-end=\"470\"\u003esediment buildup\u003c\/strong\u003e and maintain reliable operation.\u003c\/li\u003e\n\u003cli data-section-id=\"1p02e97\" data-start=\"506\" data-end=\"616\"\u003eProtect from \u003cstrong data-start=\"521\" data-end=\"546\"\u003efreezing temperatures\u003c\/strong\u003e using insulation or seasonal winterization when installed outdoors.\u003c\/li\u003e\n\u003cli data-section-id=\"iwj4xn\" data-start=\"617\" data-end=\"736\"\u003eReplace worn seals, diaphragms, and parts using \u003cstrong data-start=\"667\" data-end=\"728\"\u003egenuine \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eZurn Wilkins\u003c\/span\u003e\u003c\/span\u003e repair kits\u003c\/strong\u003e only.\u003c\/li\u003e\n\u003cli data-section-id=\"16946na\" data-start=\"737\" data-end=\"828\" data-is-last-node=\"\"\u003eAfter any maintenance or repair, \u003cstrong data-start=\"772\" data-end=\"796\"\u003ere-test the assembly\u003c\/strong\u003e before returning it to service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Zurn","offers":[{"title":"Default Title","offer_id":45805587464383,"sku":"1-375XL","price":785.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/1-375XL-2_a9585930-d541-4efc-ab99-70e4963bb3c7.jpg?v=1782960403","url":"https:\/\/www.mybackyardzone.com\/products\/1-375xl-1in-rpz-composite-vessel-fnpt-lf","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}