DC-900650-1.2, Duracast 650 Gallon Plastic Water Tank | 900650 Store your water the safe way using Duracast’s 650 gallon plastic water tanks. These vertical storage tanks are made of FDA approved polyethylene resin, which means you can store potable water and the plastic will not affect the water quality. Manufactured for incredible strength, you can rely on these storage tanks to stand up well in adverse environmental conditions. The UV-stabilized resin combats sun damage to provide years of worry-free storage. The resilient polyethylene helps the tank to maintain its original cylindrical shape. These plastic water tanks are equipped with a 16-inch vented lid and measurement indicators molded into the tank. This is a 1.2 specific gravity tank.