Square washer fits on the axle shaft of the aerating drum group on Lawnaire® IV Aerators, is part of the needle bearing group. It is also used on the tank assembly (547920) which helps hold the drum in place.
WARNING: This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov