The LiftMaster 12-87-P-075 commercial garage door opener push-on ring fastener secures washers, bearings and other components in place on output and clutch shafts. The LiftMaster 12-87-P-075 push-on ring fastener from Garage Door Supply Co. is compatible with LiftMaster commercial slide door operators. It's known by these part numbers: 87-P-075 and pa 87P075.Product Highlights: