40 Gallon, auxiliary, aft - axle fuel tank, galvanized mounting straps, fuel lines, and TITAN Electronic Controller. Generation 6 (4020217) Adds an additional 40 gallons of range to the truck's fuel system, by transferring fuel to the original equipment, mid - ship tank. Features TITAN's famous, military grade, cross - linked polymer, aft - axle tank. Includes TITAN's Electronic Controller management system, sending unit, transfer pump, wiring, fuel lines, and mounting straps. Optional filler neck assembly is also available. Like all fine TITAN products, this proven design has undergone extensive testing. Our legendary tank products are so tough and well - tested that we back them with a Lifetime Warranty No drilling or fabrication required for installation.