Woop ! I did a test of my watercooling setup, d5 vario from a reservoir of my own design to dual socket 3647 cpu blocks. Seems to work quite well, however I have some questions. --- So a G1/4 watercooling fitting uses the o-ring to provide seal. The threads only provide 'compression' for the O-rings.Is there any reason NOT to use something like a medium strength threadlocker to keep things from unscrewing ? -- Radiators : I have to assume if you are using a radiator horizontally , barbs 'down' is bad. I'm sure I'll think up a couple more dumb questions , TYIA all the same !