Thai people called wao wao is a skull bottom to suck water. In the vacuum pump water from a lower place, there must be water or a water-based lubricant to lure into the pump. When the water in the pump, it will go down the tubes. Wao this barrier prevents water flows duties into the pond. When you open the pump. Water in the pipes and the pump will remove the water in the pond. The wao will spiral (in) same side.Foot valve serves as a water catchment Do not reverse flow from the water pump to the water tank or pond until it runs out so that the pump usage in the future.
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