STRAIGHT DOOR ARM
4178B0034B is a Straight Door Arm Replacement Kit. For use with various LiftMaster® and Chamberlain® Garage Door Openers. The straight arm is commonly paired with the curved door arm; in connection to the garage door opener trolley. Check the owner's manual or replacement parts diagram for specific part information before ordering to ensure compatibility.
Refer to the following part # for the Curved Door Arm Replacement Kit: 041B0035B