DC-900165-1.5, Duracast 165 Gallon Storage Tank | 900165 Find the solution to your storage needs with these 165 gallon plastic storage tanks. All vertical tanks are rotationally molded to be a single-piece, seamless tank. Designed with an 8-inch vented manway fitting on top, these tanks provide easy access for cleaning and filling. If durability is a top priority, Duracast tanks will prove to be an effective storage solution in even unfavorable conditions. Use these vertical storage tanks outdoors and the UV stabilized resin will keep the tank from becoming sun damaged. Produced at 1.5 specific gravity, Duracast’s vertical plastic storage tanks can handle acidic substances and will resist chemical erosion. Besides chemicals and most liquid acids, you can also use a vertical tank to store potable water.