I had a burst pipe between the external stopcock and internal stopcock. It was about 0.5m underground. The pipe was steel and rusted heavily. So I have to dig it out in order to replace it. I found the other part of the steel pipe is rusted too, but usable. I have to keep this usable part. Anybody has some idea to help to extend the pipes lifetime? I thought about some anti-rusty paint, or some tape to wrap it. I am not sure if it is going to help at all.