Aluminum connector by TurboWorks. Purpose: oil system, water system, fuel system. For use with rubber and nylon hoses. External diameter 15.5mm. 9mm Suitable for AN10 14mm TurboWorks Aluminum adapter Usable for: oil system, water system, fuel system.For use with rubber and nylon hoses. TurboWorks aluminum connector. Purpose: oil system, water system, fuel system. nylon.