The leak proof ring on the water cup that has been used for a long time will often fall off. You can wash and dry the dropped leak proof leather ring first, then install it at the position of the original cup epithelial ring, and then squeeze out the air with a toothpick.
After the leak proof ring on the water cup is dropped, you can wash the leather ring first, dry it after washing, then plug it into the cup, fix the position where the leak proof ring was originally installed, and then squeeze out the air with a toothpick.
After the leak proof ring on the water cup falls off, many people will choose to water and stick the leak proof ring in order to better fix the leak proof leather ring, but this method is not desirable.
We can't use glue to stick the leak proof ring to fix it, because we usually pour hot water with a cup. When hot water touches glue, it will produce toxic substances and affect the quality of water.