The bottled water dispenser is a simple device. The water is placed upside down on top, where there is a small hole where the mouth of the bottle fits. It is designed like this, so that gravity and vacuum pressure will fill the machine with water from the bottle, which then gets released to the cup or glass when you press the faucet or spigot. As the water comes out, the air is also let inside.Ningbo Ninfun Electrical Appliances Co.,Ltd