The LiftMaster limit switch kit part 41D4671 is adjusted to tell the door how far up and down to go. This is the genuine replacement made by LiftMaster. The 41D4671 limit switch kit includes the limit switch assembly.
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Compatible with LiftMaster 1000SD, 1000SDR, 2000SD, 2000SDR, 2110, 2220, 3110, 3130, 3130M, 3220, 3240 and 3240M models