What is the proper method for connecting copper pipe to galvanized steel pipe?

The proper method for connecting copper pipe to galvanized steel pipe is through dielectric coupling. This is because copper and galvanized steel have different electrochemical properties, and when they are directly connected, it can lead to corrosion due to galvanic action. Dielectric couplings prevent this by using a non-conductive material between the two different metals, which breaks the electrical connection and thus minimizes the risk of corrosion.

This approach is crucial in plumbing systems where both types of pipes may exist, ensuring a long-lasting and leak-free connection. It also adheres to plumbing codes and best practices, which emphasize preventing corrosion in piping systems. Proper installation of dielectric unions or couplings ensures that both the integrity of the copper and the galvanized pipe is maintained over time.