Same size.
Comes with thicker or thinner o-rings so you can choose your tightness...
Would you mind sharing inner o-ring dimensions?
I figured out that original o-rings were too loose and thicker ones too tight for my preferences.
Now I'm trying to find perfect o-rings sized middle of them.
Ps. tank with pyrex tube is about 2 mm shorter than regular Boge cartomizer, so some cap is always between the PV or drip tip.