Yeah but it's not cheap and doesn't have the same punch
I got one for $5 from a guy on Craigslist when I bought some other tools he had. There were 3 of them, I would have bought all of them but I ran out of cash.
I'm not sure how much pressure you should put in it, but I just held the chuck on there for a second or so.
I can say it had plenty of punch. I filled it about halfway with solvent from my parts washer, which I believe is mineral spirits or mostly mineral spirits anyway.
It emptied that pretty fast, and sprayed it like mad. I tried it on a transmission case, valve body side for my first trial and got a fair amount on myself and the surrounding area as well.
I normally hit that area with regular brake clean in a can and manage not to spray it hither and thither in the process.
A rough guess is that it dumped about 4 times faster/harder than a can of brake clean.
So lack of punch isn't an issue, though you may want to stand back for your initial trial run, and/or use very little air pressure.
EDIT: I see it says 80-150lbs with a max of 200, hard to say how much I had on it, but I would say within normal range.