You can't use these as conical fermentors by turning them upside down and installing a valve in the neck. The slope of the "shoulders" of the carboys is way too low for this. This is reportedly why the Fermentap was discontinued - it just wasn't very good for dumping the yeast.
The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Planned: sLambic II, Flanders Red II
Primary: Fat Man Porter, Orange Blossom Mead, sLambic I
Secondary: Flanders Red I
Kegged: 3 different ciders, Janet's Brown, Barrel-aged Stout, Hallertau Blanc Pale Ale
Bottled: Flanders Red I