Many room and contents fires can be extinguished with a 1.5-inch hose line and small amounts of water. However, there are fires that advance in size before discovery and require large amounts of water coming from many hose lines. That is a time for what's called "big water." Big water comes from 2.5-inch hose lines hooked to a portable monitor (see photo), from the "deck gun" fixed monitor atop a fire engine, or from the elevated master stream from the extended ladder of a ladder truck.
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