ok, i see now. petras sells fitting for the thermochill anyways so just ask them when you get there. as for the floating pump, i do that all the time
and the petra tops do look nice. dont worry about tube sizes the threads are the only thing that is different, the outer diameter of the fittings are
the same as long as you buy them the same size (1/2" OD)

have fun in SF, i love it there. the weather is nice, cold but nice