Leak Testing! Thanks, Im going to order a load of cable braid and 3:1 heatshrink from CustomPCs soon to tame all those cables. Also I wouldn't disregard the Heatkiller block just on that basis, its one of the best blocks you can get and with a simple £1.50 extension it fixes the problem: My order from AquaTuning came this morning while watching Top Gear, it was a hard decision but it looks like I will have to watch the rest of the TG later Inside was 2 meters of Tygon 1/2" and a few plumbing bits. These male to female extension pieces are a godsend and available in various lengths. Leak testing! It's been running just over an hour strong now with no leaks and almost all the bubbles have gone. The cat seems to like it anyway!