Replaces Sprocket Coupler On Screw Drive Rail Assemblies Compatible With All Liftmaster Screw Drive And Low Profile Screw Drive Operators (1995-Current), Models 1000Sd, 2000Sd, 1000Sdr, 2000Sdr, 2110, 2220, And Models 4600, 4620, 4640, 9902, Pd420, Pd460
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