It’s a welch but the motor is made by emerson. It is 1/2 hp 9amp and was on their chemical duty line around 2005-2012. It is the only one in that lineup to use the 3/8" intake and exhaust. I left it running over night and it was only slightly warm to the touch. It does sound like an air compressor, not as loud as like a shop air compressor but you can hear it outside. I could probably insulate the spot I have the exhaust plumbed to a little better but if I had close neighbors I wouldn’t be able to leave it running.
 been running for 28 hours continuous with no issue at all. I’m at the point where its pretty much just water left to purge off (my alcohol was weaker than I thought) and I can see where my old pump might be better (it is rated for 10 micron where this one is rated for 33 micron). Of course with the old pump I would need to change the oil after 45 mins or stop for 20 minutes every 30 minutes or so. I feel so free now I can live my life while it runs