How to fix toilet leak from cistern to bowl?

trace9

For a few weeks now, water has been leaking in a small trickle into the bowl after the cistern has finished filling up. When I switch off the water supply and the cistern is emptied, there's no leak.

Initially I thought it was because the flapper/seal/seating washer was old and worn out so I replaced it but the leak still happened. I've tried around five different washers in case I had the wrong size but hasn't resolved the issue.

I've got the same toilet in the second bathroom so I tried switching the flushing mechanisms over. The water is still trickling in the first bathroom and not in the second bathroom so doesn't seem to be related to the flushing mechanism but rather something in the first bathroom cistern.

When I push down on the square vertical pipe thing, which puts pressure on the seal, the trickling stops. Does that mean it's related to the base of the cistern where the water runs out? If so, how can I fix/replace it?

EricL

Hello @trace9 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about cistern leak.

Have you tried to turn the cistern tap off and leaving the cistern full? If the leak stops with the cistern tap off, odds are it is the filling valve that is acting up and could possibly have a worn washer. But if you have tried this trouble shooting technique and the cistern still leaks then your analysis is correct, and the flushing valve seat is worn out. 

The store carries a generic flushing kit that might be compatible with your existing one. It is called the FIX-A-LOO Thunderflush Dual Flush Cistern Outlet Valve. The other option is to bring your flushing kit to the store and asking the special orders team to order one from Caroma. You can also contact our Spare Parts Department or call 1800 772 737 to order the part that you need.

If you have any other questions we can help with, please let us know.

Eric