{"product_id":"magic-plastics-0121108025-heater-union-split-nut-2-5-inch","title":"Magic Plastics 0121108025 2.5\" Hot Tub Heater Union Split Nut FBT Large Flange","description":"\u003cp\u003eEasily repair your cracked or leaking hot tub heater union without cutting plumbing using the \u003cstrong\u003eMagic Plastics 0121108025 2.5\" Heater Union Split Nut\u003c\/strong\u003e. Designed as a direct drop-in replacement, this split nut features a Female Buttress Thread (FBT) and a large flange specifically engineered to fit metal heater housings. It includes the necessary assembly screws, allowing you to secure the connection quickly and get your spa back up and running.\u003c\/p\u003e\n\n\u003ch3\u003e🚩 PRO TIP\u003c\/h3\u003e\n\u003cp\u003eBecause plumbing sizes are based on internal pipe diameter rather than physical thread measurements, a \u003cstrong\u003e2.5\" split nut actually measures approximately 3-9\/16\" (3.56\") across the inside threads\u003c\/strong\u003e. Always measure the outside diameter of your heater housing threads before ordering to ensure compatibility. This fitting does \u003cstrong\u003enot\u003c\/strong\u003e fit Jandy AquaPure 1400 systems.\u003c\/p\u003e\n\n\u003ch3\u003ePRODUCT FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo-Cut Repair:\u003c\/strong\u003e Split design allows you to replace a broken union nut without having to cut and re-glue PVC pipes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarge Flange Design:\u003c\/strong\u003e Specifically engineered with a large flange to securely grip metal heater housings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Made from high-quality, impact-resistant plastic to withstand hot tub temperatures and chemicals.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardware Included:\u003c\/strong\u003e Comes complete with the two assembly screws needed to secure the split halves together.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Fits standard 2.5\" heater tailpieces (measuring ~3-9\/16\" across the threads) found on many Balboa, Gecko, and generic spa control systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Magic Plastics\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 0121108025\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Heater Union Split Nut\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Plumbing Size:\u003c\/strong\u003e 2-1\/2\" (2.5\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActual Inside Thread Diameter:\u003c\/strong\u003e Approx. 3-9\/16\" (3.56\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Female Buttress Thread (FBT)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlange Style:\u003c\/strong\u003e Large Flange (for metal housings)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC\/GTIN:\u003c\/strong\u003e 724137624471\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFREQUENTLY ASKED QUESTIONS\u003c\/h3\u003e\n\u003ch4\u003eHow do I know if I need a 2\" or 2.5\" split nut?\u003c\/h4\u003e\n\u003cp\u003eSpa plumbing sizes refer to the internal diameter of the PVC pipe, not the nut itself. A 2.5\" split nut will measure approximately 3-9\/16\" (3.56\") across the inside threads. If your inside thread measurement is closer to 3\", you need a 2\" split nut instead.\u003c\/p\u003e\n\n\u003ch4\u003eDoes this include the heater gasket\/o-ring?\u003c\/h4\u003e\n\u003cp\u003eNo, this listing is for the split nut and assembly screws only. If your heater union is leaking, it is highly recommended to replace the 2.5\" heater gasket at the same time to ensure a watertight seal.\u003c\/p\u003e\n\n\u003ch4\u003eWill this fit a Jandy AquaPure salt cell?\u003c\/h4\u003e\n\u003cp\u003eNo. While it looks similar, this specific Magic Plastics split nut (0121108025) does not fit the Jandy AquaPure 1400 or 700 salt cell housings. It is designed for standard hot tub heater tubes.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to glue this fitting?\u003c\/h4\u003e\n\u003cp\u003eNo glue is required. The split nut simply clamps over your existing heater tailpiece flange and screws together, pulling the tailpiece tight against the heater housing when threaded on.\u003c\/p\u003e\n\n\u003ch4\u003eWhat does \"FBT\" mean?\u003c\/h4\u003e\n\u003cp\u003eFBT stands for Female Buttress Thread. Buttress threads are flat on one side and angled on the other, designed specifically to withstand the high thrust loads found in pressurized pool and spa plumbing connections.\u003c\/p\u003e\n\n\u003ch3\u003eWHY SHOP WITH AL'S COOL POOL STORE?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ Fast, reliable shipping on every order\u003c\/li\u003e\n  \u003cli\u003e✅ Genuine OEM and top-brand parts only\u003c\/li\u003e\n  \u003cli\u003e✅ Knowledgeable pool \u0026amp; spa experts ready to help\u003c\/li\u003e\n  \u003cli\u003e✅ Hassle-free returns and satisfaction guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I know if I need a 2\\\" or 2.5\\\" split nut?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spa plumbing sizes refer to the internal diameter of the PVC pipe, not the nut itself. A 2.5\\\" split nut will measure approximately 3-9\/16\\\" (3.56\\\") across the inside threads. If your inside thread measurement is closer to 3\\\", you need a 2\\\" split nut instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does this include the heater gasket\/o-ring?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No, this listing is for the split nut and assembly screws only. If your heater union is leaking, it is highly recommended to replace the 2.5\\\" heater gasket at the same time to ensure a watertight seal.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this fit a Jandy AquaPure salt cell?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. While it looks similar, this specific Magic Plastics split nut (0121108025) does not fit the Jandy AquaPure 1400 or 700 salt cell housings. It is designed for standard hot tub heater tubes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to glue this fitting?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No glue is required. The split nut simply clamps over your existing heater tailpiece flange and screws together, pulling the tailpiece tight against the heater housing when threaded on.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does \\\"FBT\\\" mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"FBT stands for Female Buttress Thread. Buttress threads are flat on one side and angled on the other, designed specifically to withstand the high thrust loads found in pressurized pool and spa plumbing connections.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Magic Plastics","offers":[{"title":"Default Title","offer_id":45360263921799,"sku":"MAG0121108025","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0634\/1217\/4983\/files\/magic-plastics-0121108025-split-nut-2-5-inch-heater-union-complete.jpg?v=1785293579","url":"https:\/\/alscoolpoolstore.com\/products\/magic-plastics-0121108025-heater-union-split-nut-2-5-inch","provider":"Al's Cool Pool Store","version":"1.0","type":"link"}