The CO2 Pressure Regulator Smart is very easy to operate thanks to a pre-set optimum operating pressure. The pressure-tight precision fine needle valve and the handy valve screw enable to make very precise bubble count settings. The swing check valve integrated in the fine needle valve protects the CO2 Pressure Regulator from a backflow of water. Includes overpressure valve. The CO2 Pressure Regulator Smart fits on all CO2 cylinders with an external cylinder valve.