Master Plumber Practice Exam

PVC, or Polyvinyl Chloride, is the most commonly used material for sewer lines due to its favorable properties. It is lightweight, making it easier to transport and install compared to heavier alternatives. PVC is also highly resistant to corrosion, which is crucial for sewer systems that frequently encounter harsh substances and chemicals. Moreover, its smooth interior surface reduces blockage and build-up, allowing for better flow and less maintenance over time.

In comparison, galvanized steel can rust over time and is generally used for water supply lines rather than sewer lines. Copper, while durable and resistant to corrosion, is more expensive and less common for sewer applications. Lead, once popular, is no longer used due to health concerns associated with lead exposure. Thus, the choice of PVC aligns perfectly with the requirements for durable and efficient sewer systems.