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When people pour water into sinks, long waiting time always makes people do other things in the period, which exactly leads to forgetting it and a waste of water. “Water controlling” can solve the problem well. The scale of the black pipe corresponds to the one in the sink. By adjusting the length of the black pipe, people can control the pondage. Open the switch of the tap and pull the pipe to some scale. When the height of water surface reaches the scale in the sink, the tap will stop pouring water, which avoids the waste of water and provide people with convenience.