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When we believe that a whole bottle of oil runs out, in fact, it does not. There are often remaining a little at the bottom and the sidewall. Because the little oil flow very slow, so no one is willing to spend a lot of time to wait it. People often throw away the bottle directly. This is actually a waste. The two oil bottles can be connected together by this oil savers. The remaining oil in bottle can flow to another slowly in your free time. Therefore, we can save a little oil through this design, and less waste.