Which of the following is a common type of plumbing pipe used for residential water lines?

Polyvinyl chloride (PVC) is a widely used type of plumbing pipe for residential water lines due to its numerous advantages. PVC is lightweight, durable, and resistant to corrosion, which makes it ideal for transporting both hot and cold water. Its smooth interior surface helps reduce water pressure loss and prevents buildup of scale and sediment. Additionally, PVC pipes are easy to install, as they can be quickly cut and joined with solvent cement or by using mechanical fittings.

In residential plumbing, PVC is particularly known for its use in drainage, waste, and vent pipes, as well as in some supply lines. It is also cost-effective compared to other materials, which contributes to its popularity among homeowners and plumbers alike.

Other options like cast iron, while used historically for drain, waste, and vent applications, are too heavy and costly for typical residential water supply lines. Concrete pipes are not typically utilized in residential plumbing for water lines due to their weight and difficulty in installation. Aluminum, while sometimes used in specific applications, is less common in residential plumbing overall and is more likely to be found in specialized systems rather than general water lines. Thus, PVC stands out as the most appropriate choice for residential water lines.