Geberit Flush Valve Seal 816.418.00.1
The 816.418.00.1 flush valve seal fits the base of the Geberit 290 mechanism. A blistered or worn bottom washer fails to close cleanly against the cistern basket, creating a permanent leak into the pan. Replacing this exact rubber ring restores a reliable seal.
- Fixes continuous leaks into the toilet pan
- Fits Geberit Twico 290 flush valves
- Measures 63mm on the outside diameter
- Constructed from durable silicone rubber
Need help? Contact us and our technical team will assist with your order.
816.418.00.1 specifications
| Specification | Detail |
|---|---|
| Part code | 816.418.00.1 |
| Brand | Geberit |
| Outside diameter | 63mm |
| Hole diameter | 32mm |
| Thickness | 2.9mm |
| Application | Geberit 290 dual flush valves |
What 816.418.00.1 does inside your toilet
Stopping Pan Leaks
The flat rubber surface forms the primary barrier that holds the flush water inside the cistern. When you press the button, the valve lifts this seal to release the water. Swapping out a degraded washer ensures the valve drops back down and seals tightly.
Twico 290 Fitment
Measuring 63mm across the outer edge with a 32mm internal hole, this part fits the Geberit 290 flush valve perfectly. The 2.9mm thickness matches the factory specification, giving you an identical part that sits correctly on the base of the mechanism.
Fitting The Geberit 816.418.00.1 Twico Washer
Extracting The Flush Valve
To change the seal, you must pull the Geberit 290 valve out of the cistern. You isolate the water supply, unclip the dual flush assembly from the base basket, and lift the entire plastic unit out of the tank to work on it.
Replacing The Rubber Seal
The old washer pulls straight off the bottom of the plastic valve. The new 816.418.00.1 seal stretches slightly over the retaining lip and slots into the groove. You must ensure the flat face points downwards before dropping the assembly back into the cistern.
Questions about 816.418.00.1
Will the 816.418.00.1 washer fit my Geberit flush valve?
This seal fits the Geberit Twico 290 dual flush valve range. You can verify fitment by checking the old rubber ring. It should measure 63mm across the outside edge and 32mm across the central hole. This part replaces older grey seals on the same valves.
Why has my toilet started trickling water?
When a flush valve seal sits underwater for years, the rubber can blister, warp, or accumulate limescale. Once the surface is no longer flat, water sneaks under the edge and continuously trickles down the back of the toilet pan.
Is the new seal the same thickness?
Yes, this replacement washer is roughly 2.6mm to 2.9mm thick, matching the Geberit specification. Fitting a seal with the correct thickness matters, as an overly thick or thin washer will stop the internal mechanism clicking back onto the cistern basket.
Still not certain this is the right part?
Fill out the contact form on our contact us page, email sales@bathroomspareparts.co.uk or phone us on 020 3940 9330. Our technical team will confirm the correct part before you order.
Customer reviews
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MPN:816.418.00.1
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GTIN:4025416069652
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Brand:Geberit
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Product Code:816.418.00.1
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Weight:3kg