This is the Midwest Industrial Tanks Double Wall Fuel Tank - 2000 Gallons. The Midwest Industrial Tanks Double-Wall Fuel Storage Tank has a unique double-wall clamshell design that meets SPCC regulations, eliminating the need for a secondary containment tank. Constructed with a 12-ga. carbon steel outer tank that fully contains the entire contents of the 10-ga. carbon steel inner tank. 2000-gal. storage capacity. UL listed.