Used Kobalt 60 Gallon Cast Iron Air Compressor. Features 3.7 Running HP, 11.5 SCFM @ 90 PSI, 13.4 SCFM @ 40 PSI, and 155 Max PSI. Oil lubricated. Broken flywheel put this out of commission for me, but could be used as a storage tank to increase the capacity of an existing system.