LiftMaster 41B3869-3A belt drive trolley assembly. Includes inside and outside trolley pieces, adjustment screw, tensioner and hardware. This is a genuine LiftMaster replacement part.
Replaces parts: 41B3869, 41B3869-1 and 41B3869-3
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Customer Questions
Compatible with Chamberlain, Craftsman and LiftMaster belt drive models that use a "T" rail.