the problem is you need tools to fix it, you need a wrench to fit the nut on the copper pipe that is running into the cystern , to check if its tight, if this is the problem its nut hard to fix,, but if the brass olive ring thats is under the nut has worn down over time, thats another problem, because its has to be cut off to get a new one on, this "brass" pipe that you say that leaking, is it at the top of the cystren? is it the overflow pipe.. or is it the water suppy pipe?
k, February 2012
