The main processing unit is a centrifuge that runs on the oil pressure.

I have a few pumps I'm considering right now for the system. One is a hydraulic pump I purchased from someone on craigslist, originally used for a plow system. The other is a random power steering pump that I believe to be from a Volvo 960, it's approximately this one. The third is a gear pump that was orginally used to deliver coolant on some piece of equipment. I'm not sure if this will reach the necessary pressure and volume, but it's smaller, which is nice.

Corny keg, if you're using one, this is a good reference for the models and information. Mine is original version, 19/32-18 fittings. They make SS disconnect fittings for it, but they're either limited to 60psi or $$, so I'm replacing them with these male flare fittings. CHI has lots of other corny keg parts.