Deck Gun 4 : A large-volume turret nozzle or monitor nozzle mounted permanently on a fire apparatus, that is usually connected to a pump. See: Deck Pipe; See also: Master Stream, Monitor Nozzle, Turret Nozzle
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}