Warning..... LOL
Well, I just looked down the chimney on my TFV4 and the inner hole is about the same size as the Ego ONE drip tip I am using on it.
The very first thing I did when I got this
tank, you guessed it, replaced the drip tip.
The TFV4 have 4 air inlet holes and the airflow is massive. The supplied drip tip is also massive with an included additional air control. Could not tell any difference with this fancy drip tip compared to the standard one other than a VERY airy draw with the tip's AFC fully open.