Leader Line 1 : (1) A hose line supplying one or more smaller lines, as in a wyed line. See: Supply Line. (2) A line from a pumper to a nozzle, as compared with a line laid from the hydrant or other water source to the pumper
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}