Why should you never allow a valve box to rest on a pipe?

A valve box should never rest on a pipe primarily because it can potentially damage the pipe beneath it. When the valve box is placed directly on the pipe, the weight and potential shifting of the box can exert pressure on the pipe. This pressure can lead to deformation or stress on the pipe, which may result in cracks or leaks. Proper support and installation of the valve box are essential to ensure that the pipe can maintain its structural integrity and function as intended.

The other options speak to different maintenance issues or concerns, such as corrosion or misalignment, but the critical reason for avoiding placing a valve box on a pipe centers on the risk of damaging the pipe itself. Proper installation practices ensure the longevity and reliability of both components within the system.