What type of pipe is coated with zinc to prevent rust but has been largely replaced in modern plumbing?

Galvanized steel pipe is a type of pipe that has been coated with zinc to protect it from rust and corrosion. The zinc coating serves as a barrier that prevents moisture from reaching the steel surface, thus prolonging its lifespan in environments where water is present. This protective measure made galvanized steel popular for use in plumbing systems and outdoor applications.

However, galvanized steel pipe has largely been replaced in modern plumbing primarily due to advancements in alternative materials that offer better performance and longevity without the drawbacks associated with steel. For instance, materials like PVC and copper do not rust and are easier to install and handle, making them more suitable for a variety of plumbing applications.

PVC is lightweight and resistant to corrosion, while copper has antimicrobial properties and is durable. The transition to these newer materials is a reflection of improvements in technology and changes in building codes, which favor plumbing solutions that minimize maintenance and enhance system efficiency. As a result, while galvanized steel pipe was once a standard choice, its use has declined significantly.