I'm planning an external reservoir for my build and have no need to fill or bleed coolant through a top mounted reservoir (this ).

I'm finalizing plans for my new build, evaluating different loop layouts so haven't bought any radiators yet. I guess you're right that the top reservoir is just an option if you intend to keep that feature. I got a little bewildered reading a statement from Shoggy in the launch thread saying: "For both pump modules we will offer another reservoir which can be exchanged with the other delrin terminal. This combination allows to run the whole setup vertically". It's the last sentence I'm responding to like if you do not fit top reservoir to the airplex with pump integrated, it does not allow the whole setup to be mounted vertically. Maybe I'm not reading it right (or read it too many times)

So unless other tells me different I'll give the vertical setup a go without a top reservoir - if I choose to apply the airplex with pump module solution. Pump at the bottom, of course!

Thanks for replying, much appreciated

Yes I know they are bulky but their potential home will be in a Caselabs TX10-D with plenty of space - and I'll be using the D5 version which is less bulky - so as long as the height of reservoir is less than- or flush with a 25mm fan, it should not be any issues with bulkiness. I'm now redirecting my concerns towards restriction with the quad pass compared to the very well refined soldering flat tube two pass design - BUT that's another topic...!

Thanks again!