This is an original early vacuum fuel pump type kerosene fuel mixer or carburetor for an Ottawa throttling governor gas engine. It should be correct for the 2 1/2, 3, and 4hp engines. It may fit other models or sizes so please do your homework to be sure it fits your application. It is in good condition with no cracks, breaks, or repairs of any kind. It has 1 npt pipe threads to mount to the engine. Please measure your engine to be sure it works for your application. After just some minor additions of needles and seats this mixer should be ready to be used on an engine or put in your inventory as a spare. These original parts are quite tough to find in the wild or even at swap meets! If you’ve been looking for one to complete a restoration or to replace your broken or repaired one here’s your chance. The pictures tell the story. It would surely beat making one! I can be reached at 262 573 193 1 if you’d like to talk about it.