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The hand air pump is a device that uses human power to generate air pressure and is often used to inflate balls. It usually consists of a cylinder with a piston inside that is connected to a handle. When the handle is operated, the piston moves up and down inside the cylinder, thereby compressing or decompressing the air inside.

There are two types of hand air pumps: the single-action pump and the double-action pump. The single-action pump can only be used to inflate objects; the double-action pump can be used to both inflate and deflate objects.

The hand air pump is a simple yet effective tool that can be used for a variety of purposes. It is an essential tool for anyone who owns a ball or any other type of inflatable object.