DC-900850-1.5, Duracast 850 Gallon Plastic Storage Tank | 900850 From industrial chemicals to liquid feed, you can use these vertical plastic storage tanks to hold a wide variety of contents. These plastic storage tanks are rotationally molded of durable polyethylene resin to provide long-lasting, convenient storage. The resin is both FDA approved and UV stabilized to be a safer, more effective storage tank. Their outstanding resistance to physical stress means that these tanks are less likely to crack or break down in harsh environments. These tanks have gallon calibrations molded into the plastic so that you know exactly how full they are at any given time. The 16-inch vented manway fittings give you easy access for filling and cleaning tanks quickly. This is a 1.5 specific gravity tank.