When using protank2's on my provaris I had all kinds of problems. On my v2 provari with the protank2 screwed on all the way, I had absolutely no airflow, protank2 would not work on that device. On my v2.5 and my mini the protank did work fairly well, but my draw was so inconsistent from head to head. The solutiion for me was the kanger air flow control valve. Thats the base that comes on the aerotank and can be purchased seperately. Have had no issues since using that base, it even works on my v2 provari.