Pressure washer...

[D-Roc]

<a href=""> Long-ass link that F-ed the format of the page</a>

I saw one of these at Costco. It would make a great pneumatic don't you think? There's some powerful ones with like 5000psi.

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[saladtossser]

you cant use it to directly pump air, you can make a piston inside a strong pipe, one side will be water at xxx-psi, the other will air at xxx-psi

[jrrdw]

Build a huge water rocket and power it with the presure washer, you could probly tag the space station with one that strong, lol.