DR. moss Co2 Diffuser Glass Nano 20mm for Aquarium live plants - Moss Fern Plant Java Valve ATOMIZER Suction cup - Regulator Solenoid The high efficiency of diffusing carbon dioxide. CO2 bubble counter is built in this device. Easy to install and use, with no extra power required. *It is ideal CO2 dissolve device and can count CO2 bubbles. Suction cup (free) x1.