Compatible with LiftMaster Estate series model 2265 (all models may not be listed)._x000D_ Compatible with LiftMaster Chamberlain garage door opener chain drive models 1240, 1245, 1250, 1255, 1260, 1260LK, 1245LK, 1240R, 1245R, 1255R, 1265, 2245, 2255, 2265, 2565, 710WHC, 1100, 2100, 4100, 5100, 7200, 1200, 2200, 4200, 6200, 7220, CG40, PD210, PD610, PD612K, 7420 (all models may not be listed)._x000D_ NOT compatible with dual sprocket units.