Dry aviation couplings are designed for use in aviation refueling systems. Use with a composite, Polyester PE-HD 300 plug, DADP250, for protection against corrosion. Specifications: Manufactured to accept the international standard 2-1/2" point bayonet, hose end refueling nozzles according to: ISO45 / MS24484 / STANAG 3105 / British Aerospace Spec. 2C14.