This is the Norwesco Heavy Duty Cone Bottom Tank - 5500 Gallon. Norwesco offers a full range of cone bottom tanks designed for a variety of applications. The conical bottoms enable quick and complete drainage. As with all Norwesco tanks, the cone bottom tanks are molded of rugged, high density polyethylene and are both impact and chemical resistant. Our Norwesco Cone Bottom Tanks are constructed with a UV stabilized resin and a specific gravity rating of 1.9 (15.8 lbs per gallon).