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After flushing the toilet, i.e., the cistern flush valve. Once the cistern refills, water leaks out again, and we are forced to close the stopcock... The flush valve is a button. I'm sorry if I'm not expressing myself correctly, as I lack knowledge in this area. In any case, I have bought a replacement rubber ball part (rubber/plastic ball with rod and nuts), but given the difficult access, I would like a professional familiar with this type of work to install it. That's why I'd like to request a quote. It's an old concealed cistern; the flat is from the 60s. Two years ago I replaced the flush valve with a new one (the blue and white plastic kind). Now it leaks water into the bowl and the tank seems to never stop filling. The stopcock is next to the tank.
