Empire Glassworks Black Penis Carb Cap features a directional flow, meaning the two holes embedded in this cap will guide the oil in a fixed airflow through the bucket. You can do this by manually turning the top knob in a circular motion when placed on a quartz banger.
The dick carb caps are a testament to their lampwork mastery. This particular model combines fun and function! Makes the perfect gag gift or "cap of shame" in any collection!