fire hose coupling A): type: Ansi Pin ; B) Size: 3", 4" and 6"; C) Material: aluminum; D) qualited member of NFPA. Fire hose coupling is a rigid interlocking end-piece on fire hose; it is used for connecting hose to hydrants or fire engine pumps and other hose appliances (nozzles, wyes, manifolds, strainers, etc).A) type: Ansi Pin type;B) Size: 3", 4" and 6";C) We ensure you high quality, ...