Tested. Proven. And shipped directly from the manufacture. We have switched our entire shop (Chicago Auto Pros) over to the Quincy air compressors and we could not be happier. We have also run theRapid Air lines to all the bay's. Quincy QT reciprocating air compressors are designed to be a compressor for life. They are built for efficiency and lower operating costs, producing more compressed air at a lower horsepower. They run at a slower RPM, run cooler and cost less to operate. Heavy-duty compressors are engineered for industrial applications and boast a best-in-the-industry 50,000-hour pump life rating.