What is a master stream device that is permanently mounted on an engine called?

• A. Deck gun
• B. Aerial ladder
• C. Monitor nozzle
• D. Portable monitor

Answer: (A)

Master streams are high-flow water streams used to knock down large fires quickly. When that stream is produced by a device that is permanently mounted on the engine, it’s designed for immediate use from the apparatus itself without needing to deploy separate gear. This fixed, engine-mounted tool is called a deck gun. It sits on the engine’s deck and delivers a powerful, long-reaching stream to control large flames from a distance or from a fixed position, making it ideal for rapid exterior attack or knockdown.

An aerial ladder is a separate, removable ladder apparatus with its own water supply, not a fixed deck-mounted unit on the engine. A monitor nozzle refers to the nozzle end of a monitor; while a monitor can be fixed, the term describes the nozzle rather than the complete fixed appliance. A portable monitor, by contrast, is not permanently attached to the engine.