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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 type). Now it's leaking into the bowl and the tank seems to never stop filling. The stopcock is next to the tank. The float mechanism works perfectly. The water flow never stops, it keeps running constantly, and we had to close the stopcock to avoid wasting water. In any case, I've bought a replacement rubber ball assembly (rubber/plastic ball with rod and nuts), but due to difficult access, I'd like a professional familiar with this type of work to install it. That's why I'd like to request a quote.
