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.
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.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.