I close the airflow, fill my mini beserker then turn the top 3/4 of a turn then turn the whole kit and kaboodle upside down and finish tightening the top cap. I have had no leaksIt didint apply on berserkers, i got good setuo for the mini, but the tank runs out fast and having the filling issues on... i use it only on flavor testing
The 24mm berserk, i cant understand why i cant get it to work like mini!