I agree with gmat.
It also recently came to me that a bypass switch might come handy, for when one would want to run the pump, without turning on the PC.
I picked up a single outlet, snap in piece. Normally, one would hack a hole in the PSU, and wire it all up (but ya'll know me, I don't do normal
)
With an Antec, you may or may not have the room to even do this, so you might have to wire an outlet.
Of course opening up your PSU will void the warranty. The only alternative is to setup an external relay, wire it into a Molex connector, and adding a power cord, just for the pump. Not the most elegant, but it will work.