Reducer 3 : A fitting used to attach small hose line to larger ones; it has a female thread on the larger side and a male thread on the smaller one. See also: Adapter
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}