The VOOPOO UFORCE Sub-Ohm Tank provides a sensational performance tank with superior quality. With this tank, you can fill 3.5mL of your favorite vape juice. This tank has triple bottom airflow control to provide airflow to the coil in the best way possible. With the sliding top-rill mechanism you will have no problem with refilling. The quick vent channel is used with a shorter chimney section than a standard sub-ohm tank that allows for rapid discharge of heat while maximizing flavor production.