S.T. International Aquarium CO2 Hanging Bubble Counter with Check Valve

This CO2 Hanging Bubble Counter with Check Valve prevents back flow into the cylinder. It has a refined aesthetic style and a transparent design for easy observations. This product may be used with a regulator to depressurize the system. It is designed to effectively calculate the CO2 quantity being released into the aquatic tank when used with a CO2 regulator. This unique CO2 Bubble Counter with Check Valve provides double protection for your CO2 pressure regulator, CO2 cylinders and other accessories. It does not waste CO2!