While you wait for answers, we may have found some information which could help you.
Click here for Toilet Flush Leaking
to fix a leak under the pan when flushing?
How can I get the cistern top off myt Gala cistern?
How do you get the cistern filler out so you can fix a leak?
Water flowing straight through cistern?
cistern takes ages to fill?
how to stop a Gala toilet cistern constantly dribbling water into the pan?
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