Aeroquip 666 and 667 medium pressure Teflon hose is widely used- in aircraft applications handling fuel, oils.and other fluids. The economy of the reusable fitting concept for military applications has been well established. Special fittings which represent up to 80% of the cost of a hose assembly are completely reusable. Engineering mock-ups can be made quickly on the spot from a small stock of bulk hose and fittings. Hose lines obsoleted by engineering changes can be readily salvaged and reworked into usable assemblies. This means inventory requirements can be greatly reduced. There are no ordering delays or waiting for factory assembled hose lines.