{"product_id":"oso-add-on-kit-fitting-kit-for-extra-superstream-accumulator-expansion-parallel-connection","title":"OSO Add On Kit Fitting Kit For Extra SuperStream Accumulator Expansion Parallel Connection","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007327\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eAdd On Kit\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eExpansion Fitting\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003eFor Extra Accumulator\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eSuperStream Compatible\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Add On Kit (11007327)\u003c\/strong\u003e — Essential expansion fitting kit for adding extra SuperStream accumulators in parallel | Includes vessel connector, isolation valve \u0026amp; brass fittings | Enables higher total flow \u0026amp; capacity | WRAS-compliant brass components | Use one kit per additional accumulator (beyond the first unit which uses Upstream Kit) | Compatible with all SuperStream models (Acc130, Acc200, Acc250, Acc350, Acc450)\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Required for every extra accumulator – simple way to scale your system\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eOne Upstream Kit serves the whole system; add this Add On Kit for each additional accumulator to connect in parallel and boost overall flow\/volume. No need to replace or upgrade the original upstream components.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO Add On Kit (11007327) is the dedicated expansion accessory that allows you to increase the total storage capacity and flow-boosting capability of your SuperStream system. Once the first accumulator is installed with the mandatory Upstream Kit 22\/28 mm (11007380), each additional accumulator requires one of these Add On Kits to connect safely and efficiently in parallel — creating a modular, high-performance cold water boosting array.\u003c\/p\u003e\n\n  \u003cp\u003eThe kit includes high-quality brass fittings: a pressure vessel connector (for secure attachment to the accumulator inlet), a full-bore isolation ball valve (for individual unit isolation during servicing without shutting down the whole system), and necessary brass bushes\/adapters. All components are WRAS-approved for potable water use, ensuring full compliance with UK Water Regulations.\u003c\/p\u003e\n\n  \u003cp\u003eThis makes scaling straightforward and cost-effective: start with one accumulator and add more as your needs grow (e.g. larger family, additional bathrooms, or commercial upgrade) without redoing the upstream plumbing. Compatible across the entire SuperStream range — perfect for creating systems that deliver exceptional simultaneous flow far beyond what a single accumulator can achieve.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the OSO Add On Kit Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eModular Expansion Made Simple\u003c\/strong\u003e — One kit per extra accumulator — no complex re-plumbing required when increasing capacity.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFull Isolation Capability\u003c\/strong\u003e — Built-in full-bore ball valve lets you service or drain one accumulator without affecting others.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWRAS-Compliant Brass\u003c\/strong\u003e — All fittings approved for drinking water systems — safe, durable \u0026amp; regulation-compliant.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility\u003c\/strong\u003e — Works with every SuperStream model (130 L to 450 L) — flexible for any system size.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCost-Effective Scaling\u003c\/strong\u003e — Add capacity incrementally without buying a second complete Upstream Kit — saves money on larger installs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuick \u0026amp; Reliable Connection\u003c\/strong\u003e — Brass vessel connector \u0026amp; fittings ensure secure, leak-free parallel linking.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eVessel Connector\u003c\/strong\u003eBrass fitting for direct, secure connection to extra accumulator inlet.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eFull-Bore Isolation Valve\u003c\/strong\u003eLever-operated ball valve — isolate individual units easily for maintenance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eBrass Bushes \u0026amp; Adapters\u003c\/strong\u003eIncludes ¼\" × ½\" BSP bush for optional gauge or future expansion.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS Approved\u003c\/strong\u003eAll components compliant for potable water use in UK systems.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eParallel System Ready\u003c\/strong\u003eEnables high-flow multi-accumulator arrays without upstream rework.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007327\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAll SuperStream accumulators (Acc130–Acc450)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eQuantity Required\u003c\/td\u003e\n\u003ctd\u003eOne per additional accumulator (after first unit with Upstream Kit)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eHigh-quality brass (WRAS-approved)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIncluded Components\u003c\/td\u003e\n\u003ctd\u003eVessel connector, isolation ball valve, brass bush\/adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Pressure\u003c\/td\u003e\n\u003ctd\u003e10 bar (matches accumulator rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eWRAS, Water Supply Regulations (UK)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Brass Pressure Vessel Connector\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full-bore Isolation Ball Valve\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Brass Bush (¼\" × ½\" BSP)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Installation \u0026amp; connection guide\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Use with: One Upstream Kit 22\/28 mm (11007380) for the complete system + one Add On Kit per extra accumulator. For Acc130-specific add-on use dedicated kit (11007328). Installation by qualified plumber per Water Regulations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow many Add On Kits do I need?\u003c\/strong\u003e\n    One for each additional accumulator beyond the first (which uses the Upstream Kit). Example: 3 accumulators = 1 Upstream + 2 Add On Kits.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it compatible with all SuperStream sizes?\u003c\/strong\u003e\n    Yes — works with Acc130, Acc200, Acc250, Acc350 \u0026amp; Acc450 models for parallel connection.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDo I still need the Upstream Kit?\u003c\/strong\u003e\n    Yes — the Upstream Kit is required for the first accumulator (pressure control, strainer, check valve etc.). Add On Kits are expansion only.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eAre the fittings WRAS-approved?\u003c\/strong\u003e\n    Yes — all brass components are approved for potable water systems under UK regulations.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I install multiple accumulators without this kit?\u003c\/strong\u003e\n    No — proper parallel connection requires these fittings for safe isolation and secure linking.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs there a special kit for Acc130?\u003c\/strong\u003e\n    Yes — use the Acc130-specific Add On Kit (11007328) if adding only extra 130 L units; this general kit (11007327) suits all sizes including mixed.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho should install the Add On Kit?\u003c\/strong\u003e\n    A qualified plumber in accordance with Water Supply Regulations — ensures compliance and preserves warranty.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734077030749,"sku":"Upstream-Add-on-Kit","price":110.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorSchematics.webp?v=1772783120","url":"https:\/\/qualityheating.co.uk\/products\/oso-add-on-kit-fitting-kit-for-extra-superstream-accumulator-expansion-parallel-connection","provider":"AIZO Quality Heating","version":"1.0","type":"link"}