Since there are so many people who still ask me about the AGR+ carto tank, I thought I’d post this information.
Kidney Puncher is selling a modified version of the tank. They’ve taken some of my suggestions and had a machinist widen the airflow channels. They’ve also added an additional fill port so that air can escape from one as you’re filling from the other.
I personally haven’t tried this tank yet, but you can find them HERE.