The Captive Cap in the new design features two notches that make fitting the cap easier while providing a more even distribution of airflow. The shape also enhances perception of the heating and cooling click. The cap can be freely slid or rotated and is compatible with all DynaVap VapCap devices with standard tip size but not with the larger HyperDyn tip. Occasional double-clicking is normal. If the cap sits too loosely, press briefly to adjust the fit.