Co2 : Regulator : SR Aquaristik : Expansion Module

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The SR Aquaristik CO2 Expansion Module allows you to add a bubble counter and needle valve to your existing single or dual stage CO2 regulator. It is easy to install and will be a great upgrade to your existing CO2 regulator whether you use it for your freshwater planted tank, saltwater calcium reactor or other CO2 purpose. NOTE: This includes just the Expansion Module - the base CO2 regulator is NOT included. Show more