Relay Supply Hose : (1) A large-diameter, lightweight, single-jacket hose de-signed to move large volumes of water at low pressure. (2) Any hose used for relays
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}