The Carbo Power M400 is a CO2 plant fertilization system. This product is also a complete set suitable for aquariums up to 400 liters. The set includes a 500 g CO2 refillable storage bottle, a stable base, a Carbo Power CO2 precision pressure reducer with two manometers for working pressure and bottle pressure, a CO2 special non-return valve, a 2-meter long CO2 special hose, a CO2 addition device Flipper with an integrated bubble counter and false gas venting, as well as a Maxi Crystal glass CO2 long-term test.