These worked glass carb caps are made specifically for use with the Pulsar RoK Electronic Dab Rig.
The bubble shape provides an airtight seal with the silicone collar that it rests on. The cap also provides directional airflow for excellent vapor production and efficiency.
Made with borosilicate glass and features a 25mm diameter.
WARNING - Cancer and Reproductive Harm - www.P65Warnings.ca.gov