I thought this is cool for all the Protank guys. FYI
http://www.myvaporstore.com/Kanger_Airflow_Control_Valve_Protank_II_Protank_p/kr-acv.htm
http://www.myvaporstore.com/Kanger_Airflow_Control_Valve_Protank_II_Protank_p/kr-acv.htm