I think it could be done, with that hose connection you could just drill a hole in the side of any RDA and plug the hose into it. There is a little o-ring on the tip that would seal it, some RDAs would probably take it better than others but there should be an good place to mount it on most of them. If you were insane enough you could split the tube and drip it straight onto each coil maybe lol?
I'm going to try it with some of my RDAs when I can get one (they don't seem to be in full production yet I think?). I haven't tried bottom feeding because the whole squeezy bottle and juice through the stem thing didn't seem like a nice solution to me. Also the bottle seems nice and easy to refill, but the other kanger bottom feeder seemed pretty good for that too.
http://cdn3.volusion.com/pnhwe.bmygz/v/vspfiles/photos/KRDB90-10.jpg
http://cdn3.volusion.com/pnhwe.bmygz/v/vspfiles/photos/KRDB90-8T.jpg
I'm going to try it with some of my RDAs when I can get one (they don't seem to be in full production yet I think?). I haven't tried bottom feeding because the whole squeezy bottle and juice through the stem thing didn't seem like a nice solution to me. Also the bottle seems nice and easy to refill, but the other kanger bottom feeder seemed pretty good for that too.
http://cdn3.volusion.com/pnhwe.bmygz/v/vspfiles/photos/KRDB90-10.jpg
http://cdn3.volusion.com/pnhwe.bmygz/v/vspfiles/photos/KRDB90-8T.jpg