What are the common materials used for water supply lines in plumbing systems?

The correct response highlights that copper, PEX, CPVC, and galvanized steel are commonly used materials for water supply lines in plumbing systems due to their favorable properties and performance characteristics.

Copper is renowned for its durability, resistance to corrosion, and ability to withstand high temperatures, making it an ideal choice for both hot and cold water supply lines. PEX (cross-linked polyethylene) has gained popularity for its flexibility, ease of installation, and resistance to scale and chlorine, allowing it to expand and contract without breaking. CPVC (chlorinated polyvinyl chloride) is another plastic piping option that is effective for hot and cold water due to its resistance to high temperatures and pressures. Galvanized steel, while less common today, was traditionally used in plumbing systems for its strength and durability but is often being replaced by more modern materials.

In contrast, the other options feature materials that are either outdated, less suitable for water supply lines, or not typically used in modern plumbing. For instance, wood is not practical for plumbing, PVC is primarily used for drainage rather than supply lines, and lead is no longer acceptable due to its health risks. The inclusion of concrete, aluminum, and glass also indicates materials that do not align with standard water supply requirements, further