I have used this in a keg (not the fermentasaurus fermenter) and it worked pretty well. I did get a bit of foaming to start with when the pressure in the keg was high, but after things came into balance it seemed to be a great pickup tube alternative. Getting clear beer from the kegs sooner is always good. I generally spund my beers, so there is some yeast in the keg that can cause ongoing haze or "bits" in the beer. The floating pickup tube got rid of all of that.