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Square Rail Trolley Kit
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041C5141-1 is a Square Rail Trolley Replacement Kit. For use with various LiftMaster® and Chamberlain® Chain Drive Garage Door Openers and Rail Assemblies. The square rail trolley is used for travel on the garage door opener rail and connects the door arm to the chain drive mechanism. Check the manual or replacement parts diagram for specific part information before ordering to ensure compatibility.