The captive cap is the latest released version of the cap compatible with all the DynaVap vaporizers. The new captive cap is looser than the traditional cap and hence provides better airflow. Also, it comes with new pits that make sure the cap doesn’t fall off the chamber. Also, the shape of the latest cap ensures better heat distribution and helps the device have better performance. So, if you are looking for a replacement cap or just something new, the captive cap is an excellent option.