I have one of the still alive and well Swiftech H220 AIO's, not the X model, the original one. I actually only bought it not so long ago as a clearance sale, completely new, so its been in use under 2 years by now. I want to expand it, in the beginning with a extra 120mm radiator, because I already have the space in my build and a radiator unused (was cleaning out some things today and found a rad in my closet). Im thinking that would make my temps even better, so why not. Only thing is, what size tubing do this AIO use? I mean, the fittings it comes with dont look like any standard size, so I wonder what size I should use to expand the loop with and also, what soft tubing should I use?