Rhino Tuff Tanks space saving design allows individual tank sizes to be stacked in any combination and eliminates hassles of handling 55 gallon drums. Rhino Tuff Tanks offers a variety of Tank sizes, combinations, and packages, all compatible with a 36" footprint with no conversion brackets required. All Tanks are constructed of Natural Virgin High-Density Polyethylene that provides exceptional stiffness without compromising physical properties. All molded inserts and bushing are constructed of #304 stainless steel making them compatible with a wide variety of fluids including DEF and many types of chemicals.