It builds air pressure. I used it on 1 car restore. now I have found another car to restore. when I went to use the compressor again I noticed it was not running as fast as it used to. It is a smaller compressor, I think 4.5 hp I know it is a bit under powered for my needs. But I do this for a hobby so it isn't used every day. I am miffed!! ___________________ James, not running as fast as it used to... how are you judging that, by the sound of it or that it's taking longer to fill the tank?
If the latter, see the troubleshooting section on the sitemap page, and follow the link to the information about air compressors that run but don't build pressure.