I have 2 of these, and since I don't often buy commercial kegs anymore one can go. It's a micromatic "D" system coupler with tailpieces so you can quickly switch to a cornie keg. A similar setup runs $43.http://www.kegglebrewing.com/Sanke-t...it_p_150.html#
I do have one extra swivel fitting for the liquid side I will include. So you would need just a gas swivel nut to complete. Unless you already use swivel nuts on your line ends.
$25 plus shipping.