Chamberlain 31D380 Garage Door Opener Sprocket Cover Genuine Original Equipment Manufacturer (OEM) Part Compatible with LiftMaster Estate series model 2265 (all models may not be listed). 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). NOT compatible with dual sprocket units.