Vertical dome tanks are freestanding with a flat bottom for easy indoor or outdoor installation. These tanks conform to NSF/ANSI Standard 61 requirements. These Roto-Mold tanks are manufactured from medium-or high-density polyethylene with UV inhibitors for longevity. The walls of these tanks are translucent for level viewing, and are equipped with gallon indicators so you don't have to risk running dry. | Ace Roto-Mold Vertical Dome Top Tank | Size 300 gal