The new DynaVap Captive Cap will help to keep your cap right where it should be; on your device. The new design features enhanced functional geometry, creating more evenly distributed airflow. In addition, the heat up and cool down 'clicks' are more noticeable. The updated Captive Cap stays firmly in place, while still rotating freely on the DynaVap. It will work on any DynaVap tip, allowing full cross compatibility.