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I know this topic has been covered extensively (!) before, but here's a new angle, I think...
I fitted a close coupled cistern with an opella torbeck siphon (internal oveflow with dual pushbutton), & a new bracket + a big solid (not foam)doughnut washer -no leaks at first then the next day a weep on flushing. Tightening bracket didn't help, so I dismantled it again & noticed that there are flats on the pipe threads -I reckon that water passes up these flats & up between the doughnut & the metal bracket/cistern base.
Next step -after reading previous posts- will be to do it again with Plumber's Mait on those threads, I reckon -anyone want to comment?
I fitted a close coupled cistern with an opella torbeck siphon (internal oveflow with dual pushbutton), & a new bracket + a big solid (not foam)doughnut washer -no leaks at first then the next day a weep on flushing. Tightening bracket didn't help, so I dismantled it again & noticed that there are flats on the pipe threads -I reckon that water passes up these flats & up between the doughnut & the metal bracket/cistern base.
Next step -after reading previous posts- will be to do it again with Plumber's Mait on those threads, I reckon -anyone want to comment?