DC-911100-1.9, Duracast 1100 Gallon Heavy Duty Vertical Tank | 911100 Just like the name suggests, these vertical storage tanks are heavy duty. People can use these tanks for chemical production, agriculture, mining, manufacturing and industrial purposes. Designed for both indoor and outdoor use, the polyethylene resin is UV stabilized and the tanks are impact resistant. The seamless, one-piece structure of these tanks improves their overall strength and reduces the chance for leaks. These tanks are equipped with a 16-inch vented lid which provides easy access for cleaning and filling. Gallon calibrations are molded into the plastic so you can measure contents at a glance. For easier viewing of content levels, use the translucent natural white tanks. This is a 1.9 specific gravity tank.