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When using a water pipe, we always squeeze the pipe to narrow down the cross section for enhancing the hydraulic pressure in order to rinse the dirt or flushing the water to a farer place, but it is very laborious and the effect is not good either, because it is possibly causes the fluent branches. Here the cross section of the water pipe is designed as the configuration of a water drop, hence it is easily to be squeezed if the narrower end on the cross section is pressed because this end is more thin and flat and there is a bigger area to enforce. In this way, the water column can be controlled accurately and easily