Compatible with all Liftmaster Screw Drive and Low Profile Screw Drive operators (1995-current).

Compatible with Liftmaster models 1000SD, 2000SD, 1000SDR, 2000SDR, 2110, 2220.

Compatible with Chamberlain models 4600, 4620, 4640, 9902, PD420, PD460-2, 9950.

Same as Part number 25A18

Replaces sprocket coupler on Screw Drive rail assemblies.