This is an original fuel mixer or carburetor for a 1 1/2 or 2hp Fairbanks Morse Z later spoked flywheel gas engine. It is part number ZAA4 and mounts with a locating pin and one hole that are about 1 15/16 inches apart on center so do your homework to be sure it is for your application. It is in very nice condition with no cracks, breaks, or repairs that I can see or know of. It will need fuel needles which are readily available. With the addition of fuel needles this should be ready to be used on an engine. If you’ve been looking for one to complete a restoration because yours is missing, broken, or repaired here is a very nice one. The pictures tell the story.