... ,2-1/2"; C) Material: aluminum; D) NFPA member. 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 ... We are the qualified member of NFPA. Ansi Pin Fire Hose Coupling