DC-900700-1.9, Duracast 700 Gallon Heavy Duty Vertical Tank | 900700 When you are looking for a tank with superior strength, look no further than Duracast’s heavy duty vertical storage tanks. These polyethylene tanks are manufactured to fulfill your chemical storage needs without the hassle or the stress. These vertical storage tanks are easy to clean so that you can quickly drain and fill them with new contents. Although these tanks are heavy duty, they are still lightweight for easier transportation. With these storage tanks, you can worry less about leaks because they are both seamless and rust-resistant. The overall toughness that these tanks have means that they can handle stress such as extreme weather and aggressive chemical attacks. Because these tanks are so durable, you can use them to store an array of contents, ranging from industrial chemicals to many liquid acids. This is a 1.9 specific gravity tank.