Which pair correctly matches a common cold water pipe material with its key property?

• A. PEX — chlorine resistance
• B. CPVC — low cost
• C. Copper — durable
• D. PVC — flexible

Answer: (C)

Durability in cold-water piping is crucial because the system must withstand pressure, temperature changes, and long-term use without leaks. Copper has a long-established reputation for withstanding these demands in potable-water systems, providing reliable performance and resistance to corrosion under typical water chemistries. That makes it the best match for a material paired with the key property of being durable. PEX is valued for its flexibility and ease of installation, CPVC is chosen for its chemical resistance and higher temperature tolerance (not simply low cost), and PVC is rigid rather than flexible, so describing it as flexible isn’t accurate.