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LiftMaster's 144B42 from Action Industries is a 28T (28-tooth) residential garage door opener replacement belt drive pulley for screw drive operators. The 144B42 is 3/4 inches with a 1/2 inch bore and a 2 inch outside diameter. This replacement pulley is used to pull the LiftMaster/Chamberlain 20B17 Mini Drive Belt and works with the 144B1 Pulley.
LiftMaster 144B42 28T (28-Tooth) Replacement Belt Drive Pulley
For residential screw drive operators
Compatible models: 2110, 2220, 3110 and 3220
Outside diameter: 2 inches
Inside diameter: 1/2 inch
Height: 3/4 inch