I have a vivi nova that I has given me a little grief as well, it sometimes leaks a little onto the battery and alot of times ill get a gurgeling sound when i draw on it for a couple drags, im wondering if this is a knock off or original and if changing the head might help, also a question on the heads, is the metal cone on top supposed to point up towards the drip tip or down toward the wic, mine came with them pointing up but i saw a pic of a new set where they were still sealed in plastic packageing (which mine were not in sealed bags) and they appeared to be pointing the other direction (toward the wic) or absent all together, I turned my 3.0 toward the wic and the leaking seems to have been reduced dramaticly, also when cleaning the last time i dropped the bottom half and the tube comming up from the bottom popped off, i pushed it back in and when i screwed the coil back on it just kinda spun but i held it and think i got it screwed in tight, this was when i turned the metal cone around and sence then the gurggling/leaking has been much less but still happens once in a while, here are some pix of the tank, Thanks for reading and PEACE B.