So I have mixed reviews on the iDab carb cap with directional airflow
I really like it for the 20mm bucket as it seals down nicely and can be spun easily to change air intake direction. It is a bit smaller than I thought and if the dab end was just an inch or so longer, it would be perfect. For the 30mm bucket, it sits on top/inside the mouth of the 30mm bucket and can seal, but is easily broken once spun to change airflow.
So in summary:
20mm good seal and worked great
30mm was not large enough and sat on/in the mouth of the bucket and broke seal easily when spun
Pros:
Really nice being see through and
Directional airflow is great for hitting the edges of the insert
nice having a pointed glass dab end for an all in one experience
Cons:
The dab end is a little short and would of been better if it was an inch or so longer
Does not seat well on the 30mm bucket
Here are some shots of it on top of the 20 and 30mm buckets:
20mm bucket:
30mm bucket:
Link to site I bought it from:
https://www.thedabstore.com/products/idab-glass-terp-turner-carb-cap