The large-capacity nutrient solution tank in the AutoPot Pro system, sized for the 24-plant CO2 room setup, with outlets on top allowing for easier top-fill and management.
Dakota selects the larger 105-gallon pro reservoir for the CO2 room run given the higher plant count (24 pots) compared to the smaller tent setups. Notes it has 'outlets on the top' as a distinguishing feature from the standard tank.
Discussed in: Ep 005