This reference cam must be placed on the toothed belt rail of your garage door and ensures that the motor can stop in time.
If this is not present, the motor has no reference point.
This is suitable for the older types of Marantec motors including the Comfort 220 and the Comfort 250 etc...
Unique at Zenderservice: We supply these in a set of 2, already assembled and reinforced with tin, you only need to place this on the timing belt!
