My 8th grade "Science" teacher (over 40 years ago) used a reefer compressor as both a compressor and as a vacuum pump.
- Jr. High Science is merely Basic Physics = introduction to how things of this world work.
A friend used one with a tank to power his airbrush. I am about to replace a bad air compressor on a medium tank with one.
I saw one mounted on a smallish tank (maybe 2' x 1') in a garage powering a forge type burner some guy was building in a YouTube video. No follow-up video, though, so no idea if it kept-up with demand.
Yes, Russ, they be super quiet and efficient, too. Most run 40 minutes of every hour, and cost only about $5 per month. Sadly however, they are designed to pump substance in a gaseous state, not liquids.
O, well. Onward & upward.