Bayonet Nozzle : A small spray applicator that has a head with a piercing device; it is used to control small fires in partitions, ceiling spaces, and other concealed areas
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}