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A good CO2 system and adding free available CO2 to the aquarium, besides a good fertilization, plays an important role to the growth of the plants in the aquarium. By adding CO2 to the aquarium the pH of the water lowers and makes it acidic, just as most plants and fish love it.
The CO2 pressure regulator has 2 manometers. The bottle pressure can be read on one meter to see how full the bottle is, and the working pressure can be read on the other meter. The needle/dosing valve allows this to be set very accurately and a precise amount of CO2 can be dosed to the aquarium.