If it is the seal at the bottom of the tank... I had one where the
flange of the syphon unit had clearly warped and was no longer a flat
surface. I tried all sorts, including making up washers out of neoprene
rubber. Nothing fixed it permanently.
In the end, I got a new "syphon" unit. Except that the new one is button
flush, which I think is a lot easier to use. No leaks since. Plus less
worries that an over-enthusiastic teenager is going to pull the whole
thing off the wall, trying to flush it before the tank has refilled.
If you are using an old, hard washer then renew it.
Where have you put the washer? It should be on the inside of the cistern.
Have you tightened the nut enough? Hand tight is not good enough.
You should have no leaks on a properly positioned and tightened washer.
Nothing was said about close coupled or otherwise in the original post, but
the washer always goes between the siphon and cistern on any installation
and of course the "donut" washer goes between cistern and pan on close
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