Texas Tradesman Plumber-Limited License Practice Exam

Copper pipe is most commonly used for residential water supply lines due to its durability, resistance to corrosion, and ability to handle high temperatures and pressures. Copper offers an excellent balance of strength and flexibility, making it suitable for various applications, including potable water systems. Additionally, copper has natural antimicrobial properties, which helps prevent the growth of harmful bacteria within the water supply, ensuring water quality and safety.

In contrast, other materials have their applications but are less favored for residential water supply lines. Cast iron, while strong and durable, is typically used for drainage systems and plumbing venting due to its weight and susceptibility to corrosion. PVC is lightweight and resistant to corrosion, making it an excellent choice for drainage and irrigation but is not approved for hot water supply lines. Galvanized steel, though used in the past for water supply, can corrode over time, leading to water quality issues and decreased water flow, making copper the more reliable choice for residential water systems.

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