1312100394 is a 7.5hp Baldor motor that is most commonly used with the Chicago Pneumatic single phase RCPC series of 7.5HP reciprocating air compressor, as well as several BelAir compressors. This is an OEM motor. This motor does not come with a pulley. You will need to remove the pulley from your old motor and install on this motor.
This motor was used on the following Chicago Pneumatic compressors