Love your RoK?  You can now enjoy an even better experience with the RoK Electric Oil Rig, thanks to this futuristic cap. 

Made with sturdy borosilicate glass, this cap is designed to provide directional airflow for improved efficiency and better taste at lower temperatures.  You can even see the airflow with this one, as it has a small ball inside that will spin as you pull your hits. 

This ultra-fun cap measures 25 mm in diameter and ensures exact fit with the RoK rig.

Shipped in a wide range of colors, which may vary from the pictures - we take requests for color preferences.