Galvanized Water Line To Copper

Use sandpaper as needed for cleaning pipe then take the union apart and solder the brass end to the copper and screw the steel end to the galvanized pipe. Installing a dielectric union to join these as well as other galvanized pipes in your house to copper requires both wrench and soldering work. 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 electrochemical reaction occurs that causes the steel pipe in this case to rust and clog up.