Looking for a better way to carry your RotopaX tank with you? You can stop your investigation, because here it is! Available in two sizes, this tank holder will work on any RotopaX tank up to five gallons. There is a two vacuum cup holder for water tanks that are three gallons or less, and a three vacuum cup holder which will hold a up to a five gallon water tank. This will work in conjunction with your existing RotopaX tank and hardware. When you are done using them, the suction cups disconnect from your vehicle in seconds. Vertical mounting is recommended. The RotopaX tank and hardware are not included.