Toilet Water Supply Pipe Leaking Inside a Wall
Examine the section of the pipe with the leak. If the leak is at a coupling, loosen the coupling with a pipe wrench, and replace it with a new one. If the leak is in the middle of the pipe, you will have to cut out the bad section with a pipe saw or rotary cutting tool with a metal cutting blade. Measure out the cut section of pipe, and cut a new pipe of the same size. Sand down the edges of the cut pipe, apply flux and solder the new pipe in place with fittings. Allow time for the solder to dry.
