Georgia Master Plumbing Practice Exam 2025 - Free Master Plumber Practice Questions and Study Guide

PVC (polyvinyl chloride) and cast iron are both widely accepted materials for sewer piping due to their durability and resistance to corrosion. PVC is favored for its lightweight, cost-effectiveness, and ease of installation, making it suitable for a variety of sewer applications. Its smooth interior surface allows for efficient flow and reduces the risk of clogs.

Cast iron, on the other hand, is traditionally used in many older sewage systems due to its strength and longevity. It can withstand high pressures and is resistant to both chemical damage and fire, making it suitable for high-quality drainage systems. The combination of these materials in the answer highlights the practical considerations in sewer system installations, ensuring longevity and reliability.

In contrast, galvanized steel is less commonly used in sewer applications due to its susceptibility to rust and corrosion over time. While copper is excellent for water supply lines, it is not typically used for sewer pipes because it can be expensive and is not as resistant to the chemicals often found in wastewater. Polyethylene is used in specific applications, such as for certain types of drainage and stormwater piping, but it is not a standard choice for sewer pipes compared to PVC and cast iron.