Which of the following service line materials is not flexible?

Galvanized iron is the service line material that is not flexible. This material is a type of steel that has been coated with zinc to prevent corrosion. Unlike materials such as PVC, polyethylene, and copper, galvanized iron is rigid and does not easily bend or flex under pressure or stress.

In distribution systems, flexibility in pipe materials allows for easier installation and adaptation to various alignments and terrain. PVC and polyethylene, for instance, are known for their flexibility, making them suitable for applications where bending is necessary. Copper, while more rigid than plastic materials, does have some malleability, allowing it to be shaped to fit certain applications without breaking.

Understanding the physical properties of these materials is crucial in selecting the appropriate one for specific applications in distribution systems. This ensures both functionality and longevity of the infrastructure.