Specifically for use with the Aquaroll, the ball value forms part of the Mains Adaptor and can be supplied separately. Suitable for 40 litre Aquaroll the valve kit is an economical way to enjoy the benefits of a continuous supply of fresh water to your caravan. The ball valve is the ideal accessory for controlling the water flow within your 40 litre Aquaroll. This simple device is easy to fit it screws into the side of your water container. Please note this is the genuine Aquaroll spare not a pattern part.