{"product_id":"aquamatic-k521-rfn-internal-parts-kit-plastic-1079621","title":"Aquamatic K521-RFN Internal Parts Kit (Plastic) 1079621","description":"\u003ch1 data-path-to-node=\"2\"\u003eAquaMatic K521-RFN Internal Parts Kit (Plastic) | Part 1079621\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003e\u003c\/b\u003e\n\u003c\/h1\u003e\n\u003cp data-path-to-node=\"6\"\u003eThe \u003cb data-path-to-node=\"6\" data-index-in-node=\"4\"\u003eAquaMatic K521-RFN Internal Parts Kit\u003c\/b\u003e (Manufacturer Part Number: \u003cb data-path-to-node=\"6\" data-index-in-node=\"69\"\u003e1079621\u003c\/b\u003e) is a premium, factory-original plastic reconstruction kit designed for \u003cb data-path-to-node=\"6\" data-index-in-node=\"149\"\u003eAquaMatic K521 Series 1-inch composite body diaphragm valves\u003c\/b\u003e. This specific kit is meticulously engineered to rebuild internal configurations for \u003cb data-path-to-node=\"6\" data-index-in-node=\"295\"\u003eNormally Open (N.O.)\u003c\/b\u003e valve operations.\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003eConstructed from high-grade, corrosion-resistant engineered plastic materials, the K521-RFN kit replaces worn or degraded structural components within the valve stack. It is essential for restoring positive seating, maintaining optimal flow dynamics, and preventing internal bypass or malfunctions in demanding commercial and industrial fluid systems.\u003c\/p\u003e\n\u003ch2 data-path-to-node=\"9\"\u003eParts Included List\u003c\/h2\u003e\n\u003cp data-path-to-node=\"10\"\u003eThis comprehensive maintenance kit includes all critical structural internal items required to rebuild the core valve assembly. It consists of the following factory schematic item numbers:\u003c\/p\u003e\n\u003cul data-path-to-node=\"11\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,0,0\"\u003e\u003cb data-path-to-node=\"11,0,0\" data-index-in-node=\"0\"\u003eItem 2 – Disc Plate (1075845):\u003c\/b\u003e Secures the internal sealing disc firmly to the assembly, providing rigid support.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,1,0\"\u003e\u003cb data-path-to-node=\"11,1,0\" data-index-in-node=\"0\"\u003eItem 4 – Shaft:\u003c\/b\u003e The central structural backbone that transmits diaphragm movement to actuate the valve.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,2,0\"\u003e\u003cb data-path-to-node=\"11,2,0\" data-index-in-node=\"0\"\u003eItem 5 – Shaft Guide:\u003c\/b\u003e Ensures smooth vertical travel and precise axial alignment of the internal stack.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,3,0\"\u003e\u003cb data-path-to-node=\"11,3,0\" data-index-in-node=\"0\"\u003eItem 10 – Lower Diaphragm Plate (1075844):\u003c\/b\u003e Clamps the lower side of the flexible elastomer diaphragm to maintain structural shape and prevent tearing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,4,0\"\u003e\u003cb data-path-to-node=\"11,4,0\" data-index-in-node=\"0\"\u003eItem 11 – Upper Diaphragm Plate (1075843):\u003c\/b\u003e Secures the top profile of the diaphragm assembly for uniform pressure distribution and efficient sealing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,5,0\"\u003e\u003cb data-path-to-node=\"11,5,0\" data-index-in-node=\"0\"\u003eItem 16 – Screw \/ Fastener:\u003c\/b\u003e Engineered for a precise thread-lock fit to secure the complete internal component stack tightly together.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0648\/3227\/4627\/files\/k521sealkit_be82face-2973-413e-bfbb-6eb09646f780.jpg?v=1766068295\" alt=\"K521-RFN Internal Parts Kit (Plastic) | GAPS Water Treatment\"\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"12\"\u003e\u003ci data-path-to-node=\"12\" data-index-in-node=\"0\"\u003eNote: Elastomer seal components and diaphragms are sold separately under specialized seal kits (such as the K521-RAN Buna-N or K521-RAV Viton kits) depending on your fluid compatibility needs.\u003c\/i\u003e\u003c\/p\u003e\n\u003ch2 data-path-to-node=\"14\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-path-to-node=\"15\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,0,0\"\u003e\u003cb data-path-to-node=\"15,0,0\" data-index-in-node=\"0\"\u003eOEM Precision Fit:\u003c\/b\u003e Designed exclusively for \u003cb data-path-to-node=\"15,0,0\" data-index-in-node=\"44\"\u003eAqMatic \/ Pentair K521 (1\")\u003c\/b\u003e composite control valves operating in a \u003cb data-path-to-node=\"15,0,0\" data-index-in-node=\"112\"\u003eNormally Open\u003c\/b\u003e state.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,1,0\"\u003e\u003cb data-path-to-node=\"15,1,0\" data-index-in-node=\"0\"\u003eCorrosion-Resistant Plastic:\u003c\/b\u003e Ideal for systems handling deionized (DI) water, harsh water softeners, chemical injection loops, acids, and caustic solutions that degrade standard metals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,2,0\"\u003e\u003cb data-path-to-node=\"15,2,0\" data-index-in-node=\"0\"\u003eComplete Core Rebuild:\u003c\/b\u003e Eliminates the guesswork of tracking down individual internal components by providing the full moving assembly stack in one SKU.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,3,0\"\u003e\u003cb data-path-to-node=\"15,3,0\" data-index-in-node=\"0\"\u003eReduces System Downtime:\u003c\/b\u003e Allows for a rapid bench or field service routine when combined with the AquaMatic 521-Z assembly tool.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-path-to-node=\"17\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable data-path-to-node=\"18\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,1,0,0\"\u003e\u003cb data-path-to-node=\"18,1,0,0\" data-index-in-node=\"0\"\u003eBrand\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,1,1,0\"\u003eAquaMatic (AqMatic \/ Pentair)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,2,0,0\"\u003e\u003cb data-path-to-node=\"18,2,0,0\" data-index-in-node=\"0\"\u003eModel Number\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,2,1,0\"\u003eK521-RFN\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,3,0,0\"\u003e\u003cb data-path-to-node=\"18,3,0,0\" data-index-in-node=\"0\"\u003eSKU \/ MPN\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,3,1,0\"\u003e1079621\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,4,0,0\"\u003e\u003cb data-path-to-node=\"18,4,0,0\" data-index-in-node=\"0\"\u003eValve Size \/ Series\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,4,1,0\"\u003e1\" K521 Composite Diaphragm Valves\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,5,0,0\"\u003e\u003cb data-path-to-node=\"18,5,0,0\" data-index-in-node=\"0\"\u003eValve Operation\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,5,1,0\"\u003eNormally Open (N.O.)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,6,0,0\"\u003e\u003cb data-path-to-node=\"18,6,0,0\" data-index-in-node=\"0\"\u003eMaterial Composition\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"18,6,1,0\"\u003eHigh-Performance Industrial Plastic \/ Thermoplastic\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 data-path-to-node=\"20\"\u003eApplications \u0026amp; Compatibility\u003c\/h2\u003e\n\u003cp data-path-to-node=\"21\"\u003eThe AquaMatic K521-RFN kit is the primary service solution for water conditioning, purification, and industrial fluid control setups utilizing Y-pattern composite valves. It is widely used in:\u003c\/p\u003e\n\u003cul data-path-to-node=\"22\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"22,0,0\"\u003eIndustrial water softening and commercial media filtration backwash loops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"22,1,0\"\u003ePure water processing and deionization (DI) exchange plants.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"22,2,0\"\u003eChemical handling, plating, and harsh process water applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote data-path-to-node=\"23\"\u003e\n\u003cp data-path-to-node=\"23,0\"\u003e\u003cb data-path-to-node=\"23,0\" data-index-in-node=\"0\"\u003eInstallation Tip:\u003c\/b\u003e To safeguard the new plastic components from scoring or stripping during installation, use the dedicated \u003cb data-path-to-node=\"23,0\" data-index-in-node=\"123\"\u003eAquaMatic 521-Z Assembly Tool (Part 1075059)\u003c\/b\u003e to lock and align the shaft guide precisely into the valve body. Ensure all threads are clean and free of debris before final tightening.\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"AQMATIC","offers":[{"title":"Default Title","offer_id":43726274592963,"sku":"11275000058 | 2001007212","price":87.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0648\/3227\/4627\/files\/K521RFN.jpg?v=1781257780","url":"https:\/\/www.gapswater.co.uk\/products\/aquamatic-k521-rfn-internal-parts-kit-plastic-1079621","provider":"GAPS Water Treatment","version":"1.0","type":"link"}