Designed to give caravans the benefit of running water where mains supply is available. Can be used with any caravan, with no expensive alterations needed. A quantity of water is held in the Aquaroll. As there is no mains pressure inside the caravan, the danger of flooding is eliminated. Easy to fit ball valve. 7.5 metres of food quality hose. Snap on, 1/2" and 3/4" threaded tap connectors included. Snap on connector to ball valve. Fits both 29L and 40L Aquarolls that have a side cap.