Also be aware that directly joining different types of metals — in this case, galvanized steel pipe and copper — can cause rapid corrosion at the joint (called dielectric corrosion).

Whenever you join copper water lines to galvanized steel pipe, you should be concerned about the corrosion caused by joining two dissimilar metals, called “galvanic corrosion.” An ...

There are three kinds of pipe, lead, copper, and galvanized pipe. You may need to scrape off sediment to see what color the pipe is. The lead pipe is gray. A galvanized pipe is gray as well ...