What must be done before moving a master stream device once the line is in operation?

Before moving a master stream device that is currently in operation, it is essential to shut it down first. A master stream is a powerful firefighting tool that delivers a significant volume of water, and without shutting it down, there is a risk of injury to personnel and causing unintentional damage or loss of control over the water flow. Moving the device while it is operational could lead to unpredictable movement, potential harm, or injury due to the high water pressure and the weight of the device itself.

Ensuring that the device is properly shut down first provides a safe environment for firefighters to adjust or relocate the master stream as needed. Proper protocols and safety measures are vital in firefighting operations, and shutting down the master stream before moving it is a crucial step in maintaining safety and effectiveness in the response efforts.