Like the model R-831-P it has three isolated contacts to open close and stop the doors and a possibility of 6 561 operational codes to enhance the security level. If your operator can be controlled by three button station then our R-831-J receiver and commercial remote controls will work with your operator.
Chain spreader for installation with 1" operator shaft & 1" door shaft.
Includes 2 shaft collars and set screws.
Designed to keep tension on the chain when used with a wall mount commercial operator. It helps avoid premature wear on the door shaft bearing and commercial operator output shaft bearing