How should copper pipe be connected to galvanized steel pipe to prevent electrolysis?

The recommended method for connecting copper pipe to galvanized steel pipe to prevent electrolysis is through the use of dielectric coupling. This approach utilizes a coupling that creates an insulating barrier between the copper and galvanized steel. The key to preventing electrolysis is to eliminate direct electrical contact between dissimilar metals. When two different metals are in contact, an electrochemical reaction can occur, leading to corrosion of one of the metals, typically the more reactive one.

Dielectric couplings are specifically designed to prevent this corrosive action by providing an insulated connection point, thereby reducing the risk of electrolysis and extending the lifespan of the piping system. This insulation allows for both types of pipe to be connected without the detrimental effects that would result from direct metal-to-metal contact, ultimately preserving the integrity of both pipes.