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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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