Mine is an ancient Ritter brand dental compressor once used in a dental office to provide compressed air to run dental tools. It is very quiet, sits under my bench and I have it wired to a bench top switch for air on demand. it will run any engine I have tried on it at typical 3-10 PSI range. Found it on eBay 10 years ago and aside from initially changing dirty oil reserve within, it has been flawless since.
Rog