Which type of pipe is known for its flexibility and low weight?

The correct choice is PVC pipe, which stands for Polyvinyl Chloride. This type of pipe is widely recognized for its flexibility and lightweight characteristics, making it an excellent choice for various plumbing applications. PVC is also resistant to corrosion and chemicals, which contributes to its long lifespan and versatility.

The combination of its lightweight nature and flexibility allows for easier handling and installation compared to heavier and more rigid materials, such as cast iron or galvanized pipe. This can greatly reduce labor costs and improve efficiency on job sites. Additionally, PVC pipes are often used in situations where bending and adapting to different layouts are necessary. This further showcases how PVC's flexibility can be beneficial in plumbing systems that require intricate routing.

In contrast, cast iron pipe is heavy and rigid, which makes it more challenging to work with in terms of installation and transportation. ABS pipe, while also lightweight, is less common for certain applications compared to PVC. Galvanized pipe, being a metal pipe, is notably heavier and not flexible, which limits its application in flexible plumbing systems. Thus, PVC pipe stands out as the ideal option for needing both flexibility and low weight in plumbing scenarios.