Which of the following piping materials is NOT permitted for use with gasoline?

Polyvinyl chloride (PVC) is not permitted for use with gasoline because it does not have the necessary chemical resistance to withstand the corrosive properties of gasoline over time. Gasoline can degrade PVC, leading to leakage and failure of the piping system, which poses serious safety and environmental risks. In contrast, materials such as cathodically protected steel and fiberglass-reinforced plastic are designed to handle the properties of gasoline safely. Additionally, cathodically protected copper, while less common, can also be used in certain applications under specific conditions. Ensuring the right materials are used is critical for maintaining the integrity and safety of fuel systems.