DC-900200-1.9, Duracast 200 Gallon Heavy Duty Vertical Tank | 900200 Finally, a chemical storage solution that is both convenient and safe. These 200 gallon vertical tanks are manufactured following specific guidelines so that they can be used for years without losing effectiveness. Use a polyethylene tank either outdoors or indoors. Tanks are designed to withstand outdoor environments just as well as an indoor setting to better meet your storage needs. Because these tanks do not have any joints, seams or welds, there is no chance for leaks. These seamless tanks will not start to deteriorate. To make storing chemicals easier, tanks are not heavy and require very little maintenance. Simply clean the tanks using the 8-inch manway fitting on top. The vented lid provides ample room to clean tanks without trouble. Besides chemicals, people commonly use these storage tanks to store potable water and certain acidic liquids like wine.