A deluge gun, fire monitor, master stream, water cannon, or deck gun is an aimable controllable high-capacity water jet used for manual firefighting or automatic fire protection systems. Fire monitors are often designed to accommodate foam which has been injected in the upstream piping. Fire monitors are often fitted to fire boats, tug boats, and on top of large firetrucks for use in manual fire fighting efforts. Fire monitors are also used in fixed fire protection systems to protect high hazards, such as aviation hangars and helicopter landing pads. Most apparatus-mounted fire monitors can be directed by a single firefighter, compared to a standard fire hose which normally requires several. Fire Monitors can also be automatically positioned for fixed systems. They can pump up to, and sometimes over, 2,000 US gallons (7,600 L) per minute.