The Titan Tank 7010211 is a 57 Gallon midship replacement fuel tank for the 2011-2016 GM Duramax. It increases the fuel capacity by 21 Gallons in your Duramax allowing you to travel much farther without worrying about fuel. 

The tank is constructed of military-grade cross-linked polyethylene (XLHDPE) and comes complete with powder-coated or plated steel mounting straps set, extruded rubber mounting bushings, and accessories.