This mixer assembly is a genuine Generac part, sold individually. This mixer assembly can be used as a replacement part for a generator. The mixer assembly is meant to affix to the manifold of the generator. The stepper motor is not included with the purchase of this mixer assembly, which comes with all other the necessary components required to replace the mixer on a generator. The mixer assembly for a generator might have to be ordered as a complete replacement in the event that the mixer is not functioning as usual. This could be as a result of general wear and tear or due to a direct impact with a hard object, which could warp the mixer beyond functionality. If the mixer is punctured, torn, ripped, or otherwise eroded, it should be removed and replaced by this genuine OEM replacement part. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. Always unplug the appliance before performing any kind of repair or replacement.This is an OEM part sourced directly from the manufacturer. It is sold individually. This mixer assembly is compatible with Generac brand generators.