Galvanized pipe is subject to which of the following?

Galvanized pipe is subject to electrolysis when it is connected to dissimilar metals, which is the correct response. This phenomenon occurs when water is present and an electric current flows through the metallic connection between the dissimilar metals. The electrolysis process leads to corrosion of the less noble metal, which in this case can degrade the galvanized pipe over time, causing structural weaknesses and leaks.

Understanding electrolysis is crucial for landscape contractors as it can affect the lifespan and reliability of irrigation systems or plumbing setups involving different metals. It is essential to ensure compatible materials are used together in any installation to avoid this issue. The long-term implications of electrolysis are significant, as they can incur additional repair and maintenance costs if not effectively managed.