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The Hansen Leveller valve enables you to set a maximum and a minimum fill level to your tank. This is a great product to use on your mains or emergency water fill when combined with rainwater harveting.
It can also be used to prevent multiple starts and stops on a supply pump so that if your tank is being filled from a sump or a well then the fill can be delayed until the water level reaches a low point and the pump will continue to fill until the water level reaches the high level.