Suction Hose 5 : Hose reinforced against collapse from atmospheric pressure and partial vacuum in the pump; it is used to draft water into fire pumps from a hydrant or other source of water
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}