The SP Tools Diesel DEF Tube Release Forks, No. 15200, are used by technicians servicing modern diesel powered Ford and Dodge trucks. Newer vehicles are equipped with diesel exhaust fluid (DEF) systems requiring frequent service, and DEF Tube Release Forks enable technicians to work more efficiently, the company says. The set of forks include three sizes, each of which have two angles designed to depress the locks retaining the lines. The fork sizes fit most DEF fill and breather lines equipped on Ford and Dodge trucks, and the different angles access most locations.