The tankRO 4 Gallon Water Storage Tank gives tasteless, odorless, and impurity free water. Get a quality tank you can rely on today for your RO system. The post cured diaphragm means sterile water distribution to keep your water safe. The water reservoir tank can hold up to 3.2 gallons of water at once, with the rest of the storage area being occupied by the pre pressurized air bladder, which helps you draw water from the tank. Designed to fit under sinks this water tank will fit most kitchen cabinets, it is made to work when lying on its side or upright. The expansion tank is durability tested at several stages and is backed with a one-year warranty. Maximum working pressure of the tank is 100 PSI. The water filter tank is also designed to survive the outdoor elements with a two-part epoxy primer and polyurethane paint finish. This is a fully functional water pressure tank for water wells. The water accumulator chamber of the RO water tank includes the highest grade of polypropylene, virgin polypropylene, meaning you have the most durable and smooth inside lining. This water storage tank is built to last with heavy duty commercial construction with durable deep drawn steel domes and precision welded seams. Improve your water today.