This is a replacement 12V DC motor for the Classic Rod Actuators and the Feedback Rod Actuators.  Replacing an Actuator motor may be necessary for a number of reasons, such as if you have burnt out the original unit because you applied too much load, or perhaps its simply come to the end of its life-cycle. Either way, these replacement motors will fit on all of the Classic style Actuators.   We have a 24v replacement motor model available here.