LiftMaster 041-0035 Chain Spreader and Sprocket EP-436 You will need to add

You will need to add model 6062 external timer for applications using an electric strike or a magnetic lock that doesn't contain a built-in timer

The Model MT-1B is a single-channel device

Rear mounted red/green traffic light assembly for bidirectional traffic

a high-quality and precision-engineered component designed for seamless integration and optimal functionality

LiftMaster 041-0035 Chain Spreader and Sprocket EP-436 You will need to addLiftMaster 041 0035 Chain Spreader and Sprocket This LiftMaster 041 0035 is a Chain Spreader and Sprocket Replacement Kit. For use with various LiftMaster and Chamberlain DC Chain Drive Garage Door Openers. Complete kit includes Chain Spreader, Sprocket, and C Clip. Check the manual or replacement parts diagram for specific part information before ordering to ensure compatibility. This replacement part is compatible with the following models: 8580WLB