Under what scenario would you typically use a shut-off valve?

Using a shut-off valve is particularly important when installing a new appliance. This tool allows for the complete cessation of water flow to that appliance, ensuring a safe installation environment. This is crucial because it prevents water leaks and potential flooding while the installation is taking place.

Choosing to use a shut-off valve in this scenario helps control the water supply effectively, providing an immediate solution if something goes wrong during the process, such as a fitting not sealing correctly or an unexpected requirement for additional modifications.

While shut-off valves can be relevant in other contexts such as changing water filters or during water quality testing, their primary function in the context of appliance installation makes this the best choice.