What is a flexible plastic pipe used in water supply systems known for its ease of installation?

The flexible plastic pipe known for its ease of installation in water supply systems is Cross-Linked Polyethylene, commonly referred to as PEX. PEX is favored in residential and commercial plumbing because it is highly flexible, allowing it to bend around corners and obstacles without needing many fittings, which not only reduces installation time but also minimizes potential leak points.

Another key characteristic of PEX is its resistance to chemical corrosion and scale build-up, making it durable for long-term use in various water supply applications. Additionally, PEX piping can expand slightly under freezing conditions, which can help prevent bursts in cold weather situations, further enhancing its practicality in a variety of environments.

Other materials listed, such as HDPE, PVC, and LDPE, do have their own applications in water supply and other systems, but they typically require more rigid installation with more fittings and connections due to their form. Therefore, while they may be useful in certain contexts, PEX stands out for its flexibility and simplicity in installation procedures.