{"product_id":"sundance-jacuzzi-jetback-fluidix-st-fluidix-reflex-fluidix-euro-part-6540643","title":"Sundance® \/ Jacuzzi® Jetback: Fluidix ST \/ Fluidix Reflex \/ Fluidix Euro – Part #6540‑643","description":"\u003cstyle\u003e\u003c!--\na {\n    text-decoration: none;\n    color: #464feb;\n}\ntr th, tr td {\n    border: 1px solid #e6e6e6;\n}\ntr th {\n    background-color: #f5f5f5;\n}\n--\u003e\u003c\/style\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cstyle\u003e\u003c!--\na {\n    text-decoration: none;\n    color: #464feb;\n}\ntr th, tr td {\n    border: 1px solid #e6e6e6;\n}\ntr th {\n    background-color: #f5f5f5;\n}\n--\u003e\u003c\/style\u003e\n\u003cdiv\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003ePart \u003cstrong\u003e6540‑643\u003c\/strong\u003e is an OEM \u003cstrong\u003eFluidix‑series jetback\u003c\/strong\u003e used in Sundance® and select Jacuzzi® spas. It is the internal jet body that accepts multiple 5″ Fluidix jet internals—including \u003cstrong\u003eFluidix ST, Fluidix Reflex, and Fluidix Euro\u003c\/strong\u003e—depending on the spa model. This jetback provides the correct water pathway, mounting threads, and sealing surfaces for Fluidix‑family jetfaces and is a critical component in the 2008+ premium Sundance® hydrotherapy system.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCompatible Spa Models \u0026amp; Years\u003c\/h3\u003e\n\u003cp\u003eFluidix jetbacks (including 6540‑643) are used extensively in Sundance® \u003cstrong\u003e880 Series\u003c\/strong\u003e, \u003cstrong\u003eSelect Series\u003c\/strong\u003e, and \u003cstrong\u003e780 Series\u003c\/strong\u003e models beginning in 2008. While the listings do not enumerate individual tub names, they clearly identify Fluidix jetback compatibility for:\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSundance® Spas\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch4\u003e\u003cstrong\u003e780 Series (Fluidix ST \/ Reflex \/ Vortex systems)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2013+\u003c\/strong\u003e 780 models using Fluidix ST\/Reflex jets\u003cbr\u003e(Chelsee, Hamilton, Certa, Montclair, Dover, Bristol, Hanover depending on year)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cstrong\u003e880 Series (Fluidix premium hydrotherapy platform)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2008+\u003c\/strong\u003e 880 Series models\u003cbr\u003e(Optima, Cameo, Maxxus, Marin, Altamar, Capri, Majesta, Aspen, etc.)\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelect Series-\u003c\/strong\u003eModels using Fluidix Reflex, ST, or Vortex jets (Constance, Victoria).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eJacuzzi® Hot Tubs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eFluidix jetbacks (including 6540‑643 equivalents) are used in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e2004+ Jacuzzi® J‑300 Series\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2006+ Jacuzzi® J‑400 Series\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2011+ Jacuzzi® LX Collection\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2015+ Jacuzzi® J‑500 Collection\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote:\u003c\/em\u003e Jacuzzi uses Fluidix jet technology only in specific models; verify the jet body visually when replacing.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eJet Family:\u003c\/strong\u003e Fluidix (ST, Reflex, Euro)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e ¾″ slip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Internal jet body supporting Fluidix directional, oscillating, and laminar jet types\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eFluidix ST jetface (6541‑010)\u003c\/li\u003e\n\u003cli\u003eFluidix Reflex jetface (6541‑169)\u003c\/li\u003e\n\u003cli\u003eFluidix Euro jetface (6540‑500)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssociated Components:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eO‑ring: \u003cstrong\u003e6540‑854\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eLeveling washer: \u003cstrong\u003e6540‑964\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRetaining nut: \u003cstrong\u003e6540‑965\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e(Jetback \/ Jet Body Assembly with ¾\" Slip Connection)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003ePurpose \u0026amp; Performance\u003c\/h3\u003e\n\u003cp\u003eThis jetback is the \u003cstrong\u003estructural and hydraulic core\u003c\/strong\u003e of the Fluidix system. It ensures optimal water flow, seals against leaks, and securely mounts the Fluidix jetface inside the spa shell. Because Fluidix jets do not use internal bearings, maintaining the correct jetback ensures consistent performance and long service life.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eRelated \/ Interchangeable Components\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6540‑843\u003c\/strong\u003e – Alternate Fluidix Euro jetback (¾″ barb)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6540‑642\u003c\/strong\u003e – Fluidix ST jet body (older revision)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6540‑522 \/ 6540‑639 \/ 6540‑644 \/ 6540‑647\u003c\/strong\u003e – Fluidix jet assemblies and hardware \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eOrdering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBe sure to match the \u003cstrong\u003econnection type (¾″ slip)\u003c\/strong\u003e and the \u003cstrong\u003eFluidix jet family\u003c\/strong\u003e—this part is \u003cstrong\u003enot compatible\u003c\/strong\u003e with DV\/DVX\/DX\/DL, SMT, or DST\/DXT 500S jet systems.\u003c\/li\u003e\n\u003cli\u003eOn Sundance® 880 Series 2008+ models, this is the \u003cstrong\u003ecorrect OEM jetback\u003c\/strong\u003e for most 5″ Fluidix jets.\u003c\/li\u003e\n\u003cli\u003eFor Jacuzzi® tubs, confirm visually that your spa uses Fluidix jet internals before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Sundance Spas","offers":[{"title":"Default Title","offer_id":46355770802348,"sku":"6540-643","price":30.27,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0756\/2077\/8156\/files\/Sundance-6540-643-3_444f1b7b-cf02-4ae3-b10e-4be79f5ee9fd.jpg?v=1780946335","url":"https:\/\/snowvalleyspas.ca\/products\/sundance-jacuzzi-jetback-fluidix-st-fluidix-reflex-fluidix-euro-part-6540643","provider":"Snow Valley Spas","version":"1.0","type":"link"}