So here's the deal - I currently have a Thermaltake Aquarius II watercooling kit running in my computer, and it just isn't enough. I think I've only seen maybe a 5 degree F temperature difference between it and my old volcano 9 HSF/fan. So, I'm slowly replacing it piece by piece. It runs off of 3/8" ID connections/tubing (as far as I remember), so I have a good 20' strand of 3/8" ID tubing. Now, here's the thing. As far as the Aquarius II system goes, it runs from a little reservoir with 2 3/8" barbs to the intake on the little bitch pump, then out the pump to the intake on the cpu block, out the cpu block to the radiator, out the radiator back to the pump. Here's what I've gotten now. I have in my possession a Eheim 1250 pump to replace that weak ass TT pump. Problem with this is that I DO have a 3/8" intake on the TT, but the output is 1/2". Where (locally without going online to find it) can I get a converter of some sort to go from 1/2" to 3/8"? Also, I have a small GPU block with 3/8" barbs that I wanted to incorporate into this. How would I go about setting it up? What I mean is what would be the easiest path for the water to travel in order to cool BOTH the gpu AND the cpu?