What can be used to temporarily stop the flow of water in a hose line?

Using a hose clamp is an effective way to temporarily stop the flow of water in a hose line. A hose clamp is designed to create a tight seal around the hose, which can restrict or halt the movement of water when applied appropriately. It can be particularly useful during operations when immediate control of water flow is necessary for safety or to address equipment issues.

Hose clamps are essential tools in firefighting as they allow firefighters to manage water supply without needing to shut down the entire water source, thus maintaining operational readiness. This equipment is specifically designed for the purpose of controlling flow in a hose, making it the most suitable choice among the options.

In contrast, other items mentioned, such as a ball valve, wrench, and screwdriver, serve different functions. A ball valve is typically used for more permanent or robust flow management and requires installation within the system. Meanwhile, a wrench and screwdriver are tools intended for other purposes, such as tightening or loosening fittings or valves, rather than for immediate control of water flow.