Scubapro Regulator Hoses are high specification Neoprene rubber is used for the outer coating allow Scubapro Superflow hoses to remain flexible at all temperatures Reinforcing fibre mid layer holds pressure increases the life of the hose  The inner bore is completely smooth and matches the internal bore of the regulator first stage for an unobstructed air flow Rubber component are impregnated with a vanilla essence to get rid of the rubber odour Scubapro BCD hoses are the are the same as their Regulator Hoses other than length. If replacement is required you can retain the coupling for further use.