This is what I got:
It's TINY. Smallest powerhead I've ever seen and I have a hydor nano powerhead as well. The flow is still pretty gentle into the refugium but it's silent, steady (and adjustable flow), and it fits right onto the input tube for the refugium with no modification.
I'll take a picture in a bit and post it up to show the size, soon as I get this pesky work stuff done!