I don't actually have a name for this one. It is from scratch. All parts are aluminum or brass except for the screws. It uses a 1/2 inch bore double acting cylinder and runs real well on as little as 5 pounds of air. The last photo was an attempt to show it running, but my digital camera was too fast to let the blur show.  I found that it will reach 3000 RPM on 25 PSI of compressed air.