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Adding CO2 to the aquarium can be complicated, but with the right accessories it becomes relatively easy. Also when you need to attach multiple aquariums to one system, you can find everything you need here.
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By placing this CO2 check valve between the CO2 bubble counter and the CO2 system, water from the aquarium is prevented from entering the CO2 pressure regulator or the CO2 solenoid valve.
The Cabochon Ruby is a durable and decorative check valve for the CO2 system . The red bullet resembles a Ruby and will not wear out with prolonged use . The beautiful design makes this a functional piece of jewelry next to your aquarium.