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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

Also known as: 012385041783, 178B33, 178B34
CAD $13.03


Control Panels

Program Easily

Directly controls Wi-Fi garage door openers and myQ-enabled accessories.

Automatic lighting

Motion-detecting control panel turns on the opener's lights.

Adjustable Light Timer

Sets the amount of time before the light turns off after use.


The 4178B0034B is compatible with the following:

Installation & Support

Replacement Parts

info California Residents: Proposition 65 WARNING