I just got a new tank section for my Kayfun. The original held 4.5ml but had a small see through section between 2 stainless steel pieces.
The new one holds 3.5ml, and is much shorter. Gone are the stainless steel section on top and bottom replaced with a single See through section.
I do like it better this way, because its shorter, and I think it looks better overall.
I go through 5-6ML of Juice a day, so a daily refill is always needed with either set up.
I've been thinking about getting a DNA40 mod of some sort though. Maybe try out that new Kanger Tank,.