The pressure reducer reduces the cylinder pressure from approx. 60 bar (displayed on pressure gauge 1) to a low 1.2 bar working pressure (displayed on pressure gauge 2) so that the CO2 supply can be easily regulated. Screw the pressure reducer onto the CO2 pressurised gas cylinder, connect the solenoid valve to the timer (not included) or CO2 controller (not included) and regulate the amount of CO2 added using the fine needle valve. The pressure reducer is suitable for disposable CO2 cylinders (U system) and reusable cylinders (M system). By unscrewing the knurled nut (W21.8x1/14) using an Allen key, the pressure reducer fits onto the M10x1 thread of the disposable cylinders. Very high-quality design: anodised aluminium, precision CNC-milled in titanium colour, quiet solenoid valve. Reliable sealing disc instead of O-ring.