What is the common use for PVC pipe in plumbing systems?

PVC (polyvinyl chloride) pipe is commonly used in plumbing systems primarily for cold water distribution. This is due to several properties of PVC that make it suitable for this application, including its durability, corrosion resistance, and cost-effectiveness. It does not conduct heat well, which makes it unfit for hot water applications, as prolonged exposure to high temperatures can lead to deformities or leakage.

Additionally, while PVC is extensively used in drainage systems, it is the specific use in cold water distribution that distinguishes its primary plumbing application. PVC can handle potable water use and does not leach harmful substances, making it safe for drinking water supply lines.

While the other uses listed, such as for hot water distribution and gas line installations, are not appropriate for PVC, its use in cold water distribution remains one of the most common applications in residential and commercial plumbing systems.