Cistern leaking

Plumbers mait or a water proof silicone (like LSX from Fernox) to fill the gap and seal the joint .

ok assuming that the cistern is plastic, it would suggest that there is a crack in the base of the cistern, this can only be rectified by replacing the cistern with a new one, prices will vary. if the cistern is a ceramic one then i would suggest a new rubber washer for the base of the syphon and this will need to be put between the sypon and the cistern and not between the cistern and the nut. hope this helps Bob

it sounds to me like the rubber washer (donut) that goes between the system and the pan isn't sealing if you go to any plumbers merchants you will be able to get a new one for a couple of pounds at most, but if it still leaks i suggest getting a plumber in because you may of over tightned your cistern and put a hairline crack in it

Hi, Assuming that the washer was installed when the ball valve was changed, You could try using either plumbers mate or silicone, both of which is not really the best option. If you have installed the washer, make sure its placed on the inside. Hope this helps

Hi, get a plumber out quick fix, think you gone wrong in replaceing it, local plumber wont cost lot ,put job on my builder get some quotes readfeed back, best wishes colin.