Just brought a toilet cistern Fluidmaster PRO45B bottom inlet valve.
It has to fit in an ancient Tyford ceramic tank on the WC which has quite a large hole for the inlet valve to sit into and also a complication is that the ceramic washer face is also at a bit of an angle.
Consequently tightening up really a lot on the back nut, it still wobbles and leaks. I read many times don't overtighten i.e. finger tight as much as you can, then a quarter turn with adjustable pliers. But i have been going at it way way more than that, with it still leaking.
As an amateur i can only think that a very big, very soft; sealing washer to go on the inside of the ceramic tank is needed? Would this be the way to go?
If so, is it possible to get such a sealing washer; or if i was to try to cut one out, what kind of rubbery spongy material could i buy to cut up? Thanks for help.