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Mend Flush Seal Water

Dual Flush keeps refilling automatically?

Hi,

My dual flush mechanism does not seal the water after it fills up the tank following a toilet flush, so water keeps leaking out into the toilet until the water level in the tank drops to a point where the mechanism opens the refill valve and the water gets topped up and stops at the top. This cycle continues indefinitely because the leak continues all the time. Can somebody tell me how to stop the leak? The mechanism is supposed to stop water escaping after the toilet is flushed. I can’t find the name and model of the mechanism but it has two buttons at the top for the option of small and large water quantity.

Many thanks,
AT

A.T.
March 2007
D.I.Y, ToiletsFlush Seal Water
Is there an exploded picture of this type of mechanism somewhere please?

A.T.
March 2007
the sealing rubber at the bottom of the flush is worn. if you isolate the water coming into the cistern then flush the toilet so there is no water left in it. then hold the flush mech with both hands half way down you can twist it and it will come apart then look on the bottom you'll see a rubber ring, look at the ring and you'll see its not sitting flat, you can remove the rubber by pulling it over the lip and clean it and put it back up the other way. 9/10 they will reseal ok.

hi-spec plumbing
March 2007

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Dual Flush Toilet Leaking - Fix & Help