This is a rectangle 42 gallon diamond plate aluminum diesel auxiliary tank and FUEL SAFE toolbox combo with Fuel Shotz installation kit for GM trucks up thru 2010. Our FUEL SAFE fuel tank/toolbox combos take fuel security to a whole new level! The fuel filler and fittings are inside a compartment under the lockable lid of the toolbox. This auxiliary tank and install kit meet the necessary DOT requirements. This Fuel Shotz system connects the auxiliary tank to the factory tank via the factory fill neck hose. This system keeps the factory tank full until the auxiliary tank is empty. The Fuel Shotz installation system is quick and easy to install with no wires or switches necessary. Large key locking toolbox with 42"L x 19"W x 9"H storage compartment allows for safe and secure storage of your tools and equipment.