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The drainage holes set in home are used to drain away sewage. However, they have also become the entrances for insects for a long time, which is really troublesome. In order to solve this problem, separate fumes and clean the drainage holes conveniently, let us introduce Float-drain, which is brand new designed. A plastic float is put inside Float-drain that the drainage hole will automatically open when the sewage flows in and close when the sewage flows away, so that insects will not get a chance to pass the drainage hole, so are the fumes. Since the cover of Float-drain is assembled by magnet and silicone, it is comfortable to open it with