An ejector is a device that is used to expel or discharge a substance from a container or system. Ejectors are often used in situations where it is not possible or practical to use other methods of discharge, such as gravity or pumps.Ejectors can be used to discharge liquids, gases, or solids from a variety of containers, including tanks, pipes, and vessels. They can also be used to discharge substances from systems, such as air conditioning systems and refrigeration systems.