Suction 2 : To take water from static sources located below the level of a pump by exhausting air from the pump chamber and using atmospheric pressure to push water through a non-collapsible suction hose into the pump
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}