What is a washing machine agitator? A washing machine agitator is a device that extends up from the bottom of a top load washing machine. It has a series of fins. As the agitator turns the fins help move clothes from the top of the machine down to the bottom of the machine and then back up again to the top. By ProMatcher Staff Updated: 08/11/2015 Get Free Quotes Today! Get Free Quotes Today! Find Local Pros Free Electric Appliance Installation Cost Estimates Related Questions Am I required to install a garbage disposal when installing a dishwasher?Top answer: Never What is the difference between a gas dryer and an electric dryer? Do washing machines have filters?Top answer: Yes Does a washing machine have a transmission?Top answer: Yes Does a washing machine require GFCI protection?Top answer: Always