●Design for uncoupling quick release fittings on fuel line to most of the cars. ●Blue: 1/4", 5/16",diameter 8mm, Ford-Mercury Dodge-Chrysler Renault ●Green: 3/8", diameter 10mm, Ford-Mercury Dodge-Chrysler Renault ●Red: G.M. Chevrolet Buick-Pontiac Renault/Fiat Ford/Opel