My overflow pipe from attic keeps dripping into backyard,,,its connected to a 2nd small water tank which i think is for radiators?? which in turn feeds of the main water tank ,, iv replaced the ballcock 2 times by 2 diff plumbers and the dripping starts again after 2 or 3 days,,,,,any help please

pat flood, September 2009

If you are certain that the new ball valve is working (and there's no reason why it shouldn't) it either needs adjusting so that the float stops the water earlier - which I would have thought the plumber would have sussed - or that water is entering the tank by another means.....namely the pipe coil inside the copper cylinder has started leaking and allowing water into it, and then directly back up to the small loft tank.

John, September 2009