DC-910900-1.5, Duracast 900 Gallon Vertical Plastic Storage Tank | 910900 These plastic storage tanks can handle a wide variety of contents, ranging from industrial chemicals to liquid feed. The polyethylene resin is FDA approved which allows you to safely store potable water as well. These tanks are designed for both outdoor and indoor use. The resin is mixed with UV stabilizers to keep these tanks in great condition for longer. The one-piece structure reduces the chance for leaks. The 16-inch vented manway fitting allows you to easily clean tanks in between uses. These tanks feature measurement indicators that are molded into the plastic which allow you to calculate content levels quickly. This is a 1.5 specific gravity tank.