This a 310 gallon fresh water tank for long term storage. It has a 2 piece threaded top cap for filling and a drop down tube for extracting water. It could be used for storing anything as it is made of quality, thick, food grade plastic. I stored 310 gallons of water preserved with food grade hydrogen peroxide for long term storage. It has been living inside for several years. My wife got tired of seeing it in the den against the wall so I decided to sell it. Unfortunately the shipping from out west is the same as the cost of the tank. This is why this is a good deal because you can take it home in your pickup truck or I can deliver. The tank is green and 32'' in diameter x 89" tall. It's diameter coupled with its height makes it easy to store without taking up too much floor space. Great for preppers, rain water storage, or anything where you would need this much water or other liquid.