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. The long fuel needle moves as it should. With just a little work and some minor additions this mixer should make a nice, usable piece. If you’ve been looking for one to complete a restoration because yours is missing, broken, or repaired here is a pretty decent one. The pictures tell the story.