This was part of my thinking as well. The diameter is different, so the robobrew dome won’t fit. However, they do seem to be the same diameter as the grainfather so you could use the dome from that unit. No clamps on the sides though so you will need some way to give an right seal, and more importantly support the weight of the still head.Interested in possibly get a guten 40L. Does anyone know if these would fit any of the stills that either keg king or kegland offer?