: I have recently replaced the piping in my shower. The old pipe was galvalized and the new was copper. At the time, I did not know about the crosion issue with dissimilar metals. I used a threaded copper female fitting and screwed it into a galvalized elbow. Does anyone know how long this will last before I need to worry about replacing it?
That will be hard to say. I don't recommend leaving galv pipe in the walls if it can be helped. Often, the pipe will close down at the connection between the two metals. So much depends on local conditions. If the pipes were in good shape before, you may be OK for a while. Terry