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A hand-pump

A pump is a machine which moves a liquid or a gas from one place to another, often upwards. There are many different kinds of pumps. Pumps need some kind of power to make them work. Sometimes the power comes from a person. Sometimes the power comes from a motor.

Drawing of the inside of a metering pump head to show how it works. The piston moves back and forth inside the pump head.

Some types of pumps are: