How do I hook this up?
http://imgur.com/3Y4cY8Y
I don't want excess cobble to fly out of the recycler if its full, but the best way I could think of doing that was a transport pipe loop. Is there a better way with RP2?
Yes there is. Just use a filter to pull cobble out of the bottom of the barrel and send to your recycle.
RP will not send something down the tube if it has no where to go so nothing will fly out of it.