Aluminum connector by TurboWorks. Purpose: oil system, water system, fuel system. For use with rubber and nylon hoses. External diameter 12.5mm. 10mm Suitable for AN8 11mm 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.