Since the Prius inverter is water cooled, I’m going to need something to pump water through it. Exactly how much cooling I will need is unclear, but better safe than sorry I figure, so I picked up a cheap auxiliary water pump for a Golf/Jetta from eBay – OE part number 1K0965561J. This was a no-name part but new and looks like it should do the job, plus it was a third of the price of the equivalent Prius part.

[NOTE: This did not do the job. Check out the other pumps in the wiki. The Prius inverter wants BIG water flow if you’re going to pump many kw out of it.]