The diesel exhaust fluid (DEF) storage solutions from Western Global, Troy, Mich., include the DEF Cube and Top Tote. The DEF Cube is a stand-alone storage that is designed for large quantities of DEF and features a design outfitted for most rugged environments, the company said. The Top Tote can be attached to the top of a TransCube Global fuel tank for a 2-in-1 diesel and DEF solution. The DEF Cube has a capacity of 132 gal. The Top Tote has a capacity of 110 gal.