144B0018 is a idler pulley (2"OD 1/2"B) replacement kit. Compatible with Models ATS211 & ATS211R garage door openers. Check the manual for your specific model number before ordering.
For use with various LiftMaster® Belt Drive and Chain Drive Garage Door Openers featuring myQ® technology dual light lenses and are not equipped with a video camera; manufactured after 2021 only
This replacement kit is compatible with the following models: 84501 84501-267 84602