DC-900330-1.9, Duracast 330 Gallon Heavy Duty Vertical Tank | 900330 These heavy duty vertical tanks demonstrate high-quality manufacturing and superb storage capabilities. Designed for liquids up to 1.9 specific gravity, these tanks can contain a wide variety of contents. Use these above ground tanks to store agricultural/industrial chemicals, liquid fertilizers, potable water and more. The tanks are made of "Food Grade" polyethylene resin and will not contaminate water. The resin is also UV stabilized, which means that the tanks will be slow to be damaged from harsh UV rays. The tank is equipped with an 8-inch vented manway fitting and gallon labels for your convenience. Take your pick from white, green and black options. The darker colored tanks are better at slowing algae growth. Choose natural white tanks for easy viewing of content levels.