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