I've just concluded a week-long study of several of the following…
KangerTech AeroTank Base
which I've passed along the suite of PT1, 1.5 + 2 I use personally and for wick/coil testing.
Although I was exceptionally skeptical that something that could constrain the already miserly and minuscule air feeds of the KPT's might enhance them, I am utterly flabbergasted that it does.
Perhaps it is some kind of venturi effect of air being forced from a ported chamber into smaller orifices but whatever the underlying physics and engineering, it absolutely works. In fact the optimal airflows are achieved by limiting the airflow from full open to one that more adequately approximates the flow of juice being supplied by the wick. This of course varies depending on temperature of juice, coil, resistance, power, differential internal tank pressure (frequency of draw), etc. And therein lies the beauty of this simple and elegant solution.
Why Kanger didn't do this long ago to address their long-standing flooding issues I don't know. The Protank's never were too airy as so many of the reviewers have insisted. Well, yeah, compared to sucking on a carto tank (unless you have a Provari at 4V+). But let's face it not everybody has that kind of wallet travel.
I strongly urge you to consider this accessory and don't use a Protank without one!
Good luck.

KangerTech AeroTank Base
which I've passed along the suite of PT1, 1.5 + 2 I use personally and for wick/coil testing.
Although I was exceptionally skeptical that something that could constrain the already miserly and minuscule air feeds of the KPT's might enhance them, I am utterly flabbergasted that it does.
Perhaps it is some kind of venturi effect of air being forced from a ported chamber into smaller orifices but whatever the underlying physics and engineering, it absolutely works. In fact the optimal airflows are achieved by limiting the airflow from full open to one that more adequately approximates the flow of juice being supplied by the wick. This of course varies depending on temperature of juice, coil, resistance, power, differential internal tank pressure (frequency of draw), etc. And therein lies the beauty of this simple and elegant solution.
Why Kanger didn't do this long ago to address their long-standing flooding issues I don't know. The Protank's never were too airy as so many of the reviewers have insisted. Well, yeah, compared to sucking on a carto tank (unless you have a Provari at 4V+). But let's face it not everybody has that kind of wallet travel.
I strongly urge you to consider this accessory and don't use a Protank without one!
Good luck.