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The bottle rim is circle, while you use a tradition funnel, it will block up the bottle rim and the liquid flow into bottle slow and difficult, because there is air in bottle comes out.
There are 2 main advantages in this design
1. While using this funnel, in the inflow bottle that the liquid can be smoother and faster.
2. The floral form of funnel offers another one to enjoy on the vision relatively to the traditional funnel.
Because the section of this funnel is oval-shaped, so there are gaps when bottle rim and funnel contact. Thus the air in the bottle could come out through the gaps, then the liquid could flow into bottle smoothly.