Hose Coupling 2
Hose Coupling 2 : rigid interlocking end-pieces on fire hose; used for connecting hose to hydrants or fire engine pumps and other hose appliances (nozzles, wyes, manifolds, strainers, etc). ; standardized sizes and threads or other (non-threaded) pressure-sustaining interlocks (e. g. , "Storz" or other "quarter-turn" connectors); lugs, cams, or pins are used to tighten and loosen couplings by hand or with a hose wrench