So I'm getting used to mine now. I made my fittings with copper which is cheap, easy and wonderful. When my keggle is flat, it will drain to about 2 or 3 quarts, but if I tip my keggle with a 2x4 block, I can suck it dry. I did this last night with the Dunedin Dumber, 1 oz of leaf in the bottom (came to about 3/4 of a quart of leaf, plus maybe 500 ml of wort left altogether).
Here's the fitting - 1/2" copper fits perfectly in the weldless fitting from hopdawgs. I wondered if it would lose the siphon, but it does maintain, although a tiny bit of air does get in. I'm going to fit some teflon tape to it next time.
[attachment=1:5c9hgpas]keggle 001.jpg[/attachment:5c9hgpas]
The hose fits nicely on 1/2" copper as well. The fittings slide into the tee nicely - no need to solder...
[attachment=0:5c9hgpas]keggle 003.jpg[/attachment:5c9hgpas]