Description
The 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.
⚠️ Compatibility Notice: The Siamp Optima 49 fits lid holes from 16mm to 50mm 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, contact us and we’ll help confirm the correct part.
Key Features
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Universal fit — suits plastic and ceramic cisterns with lid holes from 16mm to 50mm
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Dual flush — separate half and full flush buttons for water efficiency
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Adjustable small flush volume — from 2L to 4.5L to suit your needs
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Off-centre button compatible — offset up to ±15mm supported
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Cuttable overflow tube — adjustable in 4mm increments for precise fit
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Adjustable stirrup — adjustable in 12mm increments
- Adjustable dead water level
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High flush rate — 3.5L/s for effective bowl clearing
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Low actuation effort — below 20 Newton for easy operation
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Foam pan seal included — compensates for pan irregularities
Technical Specification
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Brand: Siamp
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Model: Optima 49
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SKU: 32499910
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Compatible cisterns: Plastic and ceramic cisterns
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Lid hole diameter: 16mm – 50mm (with or without collar depending on diameter)
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Button offset: ±15mm off-centre
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Small flush volume: Adjustable 2L – 4.5L
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Flush rate: 3.5L/s
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Actuation effort: Below 20 Newton
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Overflow adjustment: Cuttable in 4mm increments
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Stirrup adjustment: 12mm increments
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Included: Foam pan seal
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Country of Origin: France
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Barcode: 3247230071296
Delivery Information
This 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. Browse all items covered by the small delivery charge.
Related Cistern Spares
Frequently Asked Questions
What cisterns is the Siamp Optima 49 compatible with?
The 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 contact us to confirm.
How do I adjust the small flush volume?
The 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.
Can I cut the overflow tube to fit my cistern?
Yes — the overflow tube can be cut in 4mm increments to achieve the correct height for your cistern.
What is the foam pan seal for?
The 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.
How quickly will my order be dispatched?
If 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.
Can I order if the item shows as out of stock?
Yes — you can still place an order and we’ll source it for you. Contact us at customerservice@bubblegumbathrooms.co.uk or call 01603 381095 if you need a lead time estimate.
Is delivery free?
This 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.
