Aluminum connector by TurboWorks. Purpose: oil system, water system, fuel system. For use with rubber and nylon hoses. External diameter 9.5mm. 7mm Suitable for AN6 8.5mm 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 and nylon.