Elliptical Tanks can be selected for stationary or transportable (non-D.O.T. regulated) applications both indoors and outdoors. The elliptical tank lowers the center of gravity to enhance stability and visibility. The tanks feature a standard 2-1/2” collection sump on the bottom for full drain out. An 8-1/2” deep sump option is available on the 500-1000 gallon sizes. Sump is located directly under the lid on standard tanks, but a center sump option is available on 1600 gallon deep sump tank. These tanks require the bottom to be fully supported with a cradle for use. The tanks are manufactured from medium-density polyethylene with U.V. stabilizers and are designed for containment of liquids of up to 1.7 specific gravity. Tank walls are translucent for level viewing and equipped with gallon indicators.