Hi,
Our toilet has been flushing less & less reliably. As it's see through
plastic, I can see that when the plunger which should lift the water
up into the u-bend of the cistern to start the siphon, is failing to
do so, almost gets there.

But I can't see anything wrong.

Is there some kind of seal around the plunger which may have
disintegrated?

Do I have to in case replace the whole cistern unit?

--
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