How To Join Galvanized to Copper Pipes
Introduction
Water leaks from old galvanized steel water pipe are common at joints, especially when they're joined to copper. Use a dielectric coupling when fixing the problem to prevent further damage.Replace a Leaky Galvanized Steel Pipe
It’s far easier to make a repair to steel pipe with copper than with galvanized plumbing pipe, because the galvanized calls for cutting threads on exact lengths of pipe. But first, call your local plumbing inspector or water utility and ask for a pipe recommendation. The water in some regions is highly corrosive to copper, making plastic (CPVC or PEX) a better choice.
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).
To limit this problem, make the steel/copper connections with special dielectric unions rather than with a regular coupling. This type of union separates the two metals with a rubber washer and plastic sleeve so they don’t actually touch each other.
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