Industrail compressor for some serious air, 6"X3-1\2"X2-3\4". I acquired this from a Portland packaging company many years ago and never did put 3 phase power back to our industrial property. It rotates and sucks air nicely but I think that it would be wise to check clearences on wear componets, like the rod journals and rings, clean the valves, new oil before putting it in service. I could never find an online source for a manual. I'm fairly confident that the tank is in good shape, we could pull one of the plugs and inspect it. I do have a 3 phase 10HP motor available that should run this. Make me a reasonable offer, Thanks for looking and have a nice day.