This otherworldly carb cap shaped like a UFO is fully reversible so you can use it from both sides.  Just pick a side and put the carb cap on top of the bucket once you've dropped your dab onto it.  Then move the carb cap up & down and around to control the airflow for a more dialed-in dabbing experience.

This directional airflow 28mm carb cap helps you maximize the production of vapor so you get those long, satisfying, and tasty hits you deserve.  This carb cap with the reversible design is made of strong borosilicate glass.  It's suitable for most nails and bangers with 28mm or less bucket openings.