pump uses 115-125volts, where the max output is 12volts
so, i guess you could open up your PSU, and make another connection from where the power cable plug ins, if your psu has a monitor output on it, just cut the wires from that and put your pump cable into it
i wouldnt recomend this though, you needa be good at wiring, and make cause the psu to lack in power (prolly wont happen)
also, if anything fails, remember your pump fails, comp overheats, and F***s lots of things up, so be careful
i just wired my pump up to a relay, so the pump turns on when i turn the computer on, but still, i have an addition power cable to the box, what i did is i ripped the powerplugin thing from an old PSU, and put it on my case, then use an addition computer plugin cable to my computer, looks good, nothing wrong with it
you could even tape 2 power cables together if you do this, and itll just look as good, and you shouldnt have a prob