Well, I recently picked up this old tire changer, it looks just like the manual ones you see on ebay, that are usually painted red. This does have a Schrader valve on top, and I am not sure what is powered by air, it looks like it has an air cylinder that operates a bead breaker. I tried to see if I could find any information on it, by searching the web, no luck, anyone know about these, any dangers or safety issues with using one ? I don't plan to use it or try it until I figure out how it works anyway, I had bought a Kohler K321S from a young farmer, which he recieved in a lot he bought, has no use for it, tire changer and other things, for the price I could not go wrong.