A deck gun is a type of naval artillery mounted on the deck of a submarine. Most submarine deck guns were open; however, a few larger submarines placed these guns in a turret.

What is a deck gun used for?

A deluge gun, fire monitor, master stream or deck gun is an aimable controllable high-capacity water jet used for manual firefighting or automatic fire protection systems. Deluge guns are often designed to accommodate foam which has been injected in the upstream piping.

Is a deck gun a master stream?

The apparatus-mounted master stream (or deck gun) is a potent and versatile tool fire officers often overlook as a tactical option. For fires within its reach, there is arguably no faster way to deploy a fire stream than with a monitor that is already connected to the pump.