Sometimes 5 gallons is just not enough. Active classrooms, like art rooms, may benefit from having a bit more in the tank. For those busy little bees, we offer 6 Gallon Water Tank. Keep an extra around as a backup to your portable sink system – not to worry, it easily attaches to any of our portable sink systems. The 6 Gallon Water Tank is FDA approved and comes equipped with a convenient carrying handle for easier transport.