With this base you can change the draw on your tank when you tighten or loosen the base. NOTE: I have seen this item sold a bit cheaper buy that store was out of stock.
New Kanger Protank Air Control Base – $5.95 USA
This new Air Control base plate will work on the Kanger Protank 2, 3, and Aerotank. Get the new Airflow control base for only $5.95.