Water coolers water supply starts with button

Button

— devices in which the water supply is turned on and off with a separate button. Such buttons may have latches — in case of draining large volumes of water. However, very often they work on the principle of "open while pressed". An interesting feature of devices with this type of control is that they can be equipped with one spout for all types of water. And the specific type of water supplied depends on which button is pressed.