Bruce Pro Innovations YellowJacket RDA comes with a sqounk pin + extra o-rings and screws.
26mm outer diameter - 25mm base - 24mm with only the ultem cap.
The metal cap sits on an o-ring on the top of the ultem cap and controls the airflow setting.
Airflow fully open is acceptable (maybe minimally restricted) and can be controlled as required.
3mm 6 wraps Ni80 Aliens coils are easy to install and is what I recommend.
Oversquonkning will get you spittback, but I do not get it to leak in a way.
With 0.10 Ohm coils on the Athena and Samsung 20S, it works like a dream. The taste is emphasized rather softly but intense.
Airflow coming from the center through the gold stick and down on the coils feels soft and nice.
When squoning, the juice flows out of the half-round top and directly on to the coils.
The rda is may not hybrid secure. All in all, I'm impressed by the rda: n ... nothing to complain about so far.