An agitator is a device or mechanism used to put something into motion by shaking or stirring. In general, agitators usually consist of an impeller and a shaft. An impeller is a rotor located within a tube or conduit attached to the shaft. Agitators are used to mix liquids or products together or to prevent congealing. An assembly is set of manufactured parts or components that work together in unison as one mechanism or device. Features. 4 oz Agitator Lid Assembly. Made with high quality materialSpecifications. Capacity 4 oz. Length 10 in.. Width 8 in.. Height 3 in.