{"product_id":"siamp-optima-49-dual-flush-valve-32499910","title":"Siamp Optima 49 Dual Flush Valve | Universal Fit | Plastic \u0026 Ceramic Cisterns","description":"\u003cp\u003eThe Siamp Optima 49 is a high-performance universal dual flush valve designed to replace worn or faulty flush valves in a wide range of plastic and ceramic toilet cisterns. With an adjustable small flush volume (2–4.5L), cuttable overflow tube, and off-centre button compatibility, the Optima 49 offers a versatile, reliable fit across many cistern brands and configurations. A foam pan seal is included to compensate for pan irregularities.\u003c\/p\u003e\n\n\u003cp style=\"background:#fff8e1;border-left:4px solid #f9a825;padding:12px 16px;margin:16px 0;\"\u003e⚠️ \u003cstrong\u003eCompatibility Notice:\u003c\/strong\u003e The Siamp Optima 49 fits lid holes from \u003cstrong\u003e16mm to 50mm\u003c\/strong\u003e and is suitable for plastic and ceramic cisterns. Button offset up to ±15mm is supported. Please measure your lid hole diameter and check your cistern type before ordering. If you’re unsure, \u003ca href=\"mailto:customerservice@bubblegumbathrooms.co.uk\"\u003econtact us\u003c\/a\u003e and we’ll help confirm the correct part.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal fit\u003c\/strong\u003e — suits plastic and ceramic cisterns with lid holes from 16mm to 50mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual flush\u003c\/strong\u003e — separate half and full flush buttons for water efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable small flush volume\u003c\/strong\u003e — from 2L to 4.5L to suit your needs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-centre button compatible\u003c\/strong\u003e — offset up to ±15mm supported\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCuttable overflow tube\u003c\/strong\u003e — adjustable in 4mm increments for precise fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable stirrup\u003c\/strong\u003e — adjustable in 12mm increments\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAdjustable dead water level\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh flush rate\u003c\/strong\u003e — 3.5L\/s for effective bowl clearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow actuation effort\u003c\/strong\u003e — below 20 Newton for easy operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFoam pan seal included\u003c\/strong\u003e — compensates for pan irregularities\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specification\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Siamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Optima 49\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 32499910\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible cisterns:\u003c\/strong\u003e Plastic and ceramic cisterns\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLid hole diameter:\u003c\/strong\u003e 16mm – 50mm (with or without collar depending on diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eButton offset:\u003c\/strong\u003e ±15mm off-centre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall flush volume:\u003c\/strong\u003e Adjustable 2L – 4.5L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlush rate:\u003c\/strong\u003e 3.5L\/s\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActuation effort:\u003c\/strong\u003e Below 20 Newton\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverflow adjustment:\u003c\/strong\u003e Cuttable in 4mm increments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStirrup adjustment:\u003c\/strong\u003e 12mm increments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Foam pan seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e France\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e 3247230071296\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDelivery Information\u003c\/h2\u003e\n\u003cp\u003eThis is a small, postable item covered by a one-off small item delivery charge. You can combine it with other small items in a single order and pay just one delivery charge. \u003ca href=\"\/collections\/small-items\" target=\"_blank\"\u003eBrowse all items covered by the small delivery charge\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Cistern Spares\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/siamp-replacement-rubber-seal-storm-33a-skipper-36a-45\" target=\"_blank\"\u003eSiamp Replacement Rubber Seal | Storm 33A \/ Skipper 36A \/ 45 Inlet Valves\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pro750uk-fluidmaster-lever-flush-valve\" target=\"_blank\"\u003eFluidmaster PRO750UK Professional Dual Flush Valve | Universal Fit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/fluidmaster-replacement-button-for-pro820uk\" target=\"_blank\"\u003eFluidmaster PRO820UK Replacement Dual Flush Button \u0026amp; Rod\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat cisterns is the Siamp Optima 49 compatible with?\u003c\/strong\u003e\u003cbr\u003eThe Optima 49 is a universal valve designed to fit a wide range of plastic and ceramic cisterns. It supports lid hole diameters from 16mm to 50mm (with or without collar) and an off-centre button offset of up to ±15mm. If you’re unsure whether it fits your cistern, measure your lid hole diameter and \u003ca href=\"mailto:customerservice@bubblegumbathrooms.co.uk\"\u003econtact us\u003c\/a\u003e to confirm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I adjust the small flush volume?\u003c\/strong\u003e\u003cbr\u003eThe small flush volume is adjustable between 2L and 4.5L. The adjustment is made during installation using the valve’s built-in mechanism — refer to the installation guide included with the valve.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I cut the overflow tube to fit my cistern?\u003c\/strong\u003e\u003cbr\u003eYes — the overflow tube can be cut in 4mm increments to achieve the correct height for your cistern.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the foam pan seal for?\u003c\/strong\u003e\u003cbr\u003eThe foam pan seal is included to help create a better seal between the cistern and the WC pan, compensating for minor irregularities on the pan surface.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow quickly will my order be dispatched?\u003c\/strong\u003e\u003cbr\u003eIf the item shows as in stock, it will be dispatched within 48 hours. If the item is showing as 0 stock, it is ordered in specially for you and will typically be dispatched within 4 working days.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I order if the item shows as out of stock?\u003c\/strong\u003e\u003cbr\u003eYes — you can still place an order and we’ll source it for you. Contact us at \u003ca href=\"mailto:customerservice@bubblegumbathrooms.co.uk\"\u003ecustomerservice@bubblegumbathrooms.co.uk\u003c\/a\u003e or call 01603 381095 if you need a lead time estimate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs delivery free?\u003c\/strong\u003e\u003cbr\u003eThis is a small postable item with a one-off small item delivery charge. You can combine multiple small items in one order and pay a single charge.\u003c\/p\u003e","brand":"Siamp","offers":[{"title":"Default Title","offer_id":54718447321425,"sku":"32499910","price":25.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/3687\/9441\/files\/k09734-extra-large.jpg?v=1787918162","url":"https:\/\/bubblegumbathrooms.com\/products\/siamp-optima-49-dual-flush-valve-32499910","provider":"Bubblegum Bathrooms","version":"1.0","type":"link"}