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, Orange Blossom Mead, Fat Man Porter
Primary:sLambic I, Janet's Brown
Secondary: Toasted Caramel Port, Flanders Red
Kegged: Hefeweizen, Centurion Falcon IPA< Dark Saison
2013 dump volume: ~2 gallons