All Combo co2 units come with the a ph controller sms 122 and the co2 regulator including the items listed below
1 sms 122 co2 automatic shutoff made by milwaukee 1 JBJ CO2 Regulator with needle valve, solenoid valve, and bubble counter . Dual guage regulator displays output pressure and bottle pressure. Standard American CO2 bottle connection. made by JBJ Aqua Medic Membrane Diffuser Double passive reactor w/2 membrane tubes for up to 50g.