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Traditional funnel’s mouth is round, when people use the funnel to fill liquid into a bottle. the funnel and bottle mouth will stick together tightly, which make the liquid flow slowly, even overflow out of the funnel if you fill too fast. This is caused by air pressure. Our design aims to solve the above problem, by adding a groove outside the funnel, there is always a clearance between funnel and bottle mouth, which can keep air circulating of bottle inside and outside , thus speed up the flow of liquid and save a lot of time