Which type of piping is characterized by its flexibility and resistance to freezing?

The correct choice is PEX (cross-linked polyethylene) piping, which is widely recognized for its flexibility and ability to resist freezing temperatures. PEX is designed to expand if water freezes inside it, reducing the risk of bursting compared to more rigid materials. This characteristic makes PEX particularly suited for plumbing systems in regions that experience significant cold weather.

Additionally, PEX is lightweight and easy to install, allowing for bends and curves without the need for fittings, which further enhances its practicality in various applications. Its chemical resistance and longevity in harsh environments are additional benefits, making it a popular choice for residential and commercial plumbing.

While CPVC is also used in plumbing, it is more rigid and can become brittle in cold temperatures. Cast Iron, on the other hand, is heavy and not flexible, making it unsuitable for applications requiring adaptability to temperature variations. Copper, while durable and effective in many applications, is prone to freezing and can burst if water inside it freezes. These limitations highlight why PEX stands out for its flexibility and freeze resistance.