I have the same setup too now due to
@Dgallo and
@Loud Brewing help. The only thing I would add is that to make sure your purge keg and bucket are more or less on the same horizontal level as the fermenter. Why? When I first tried this, I had the keg and bucket on the floor and because my fermenter is elevated, it created a siphon which resulted in the siphon sucking more CO2 out of the fermenter than the yeast could produce during fermentation. I caught it in time though but you can imagine the horror on my face when I checked on it shortly after hookup and saw my fermonster looking more like an hour glass instead of a cylinder - I created a vacuum! lol. Ever since, I have them at same height like in the picture.