Before you start, make sure the CO2 regulator is securely attached to the CO2 cylinder. The CO2 tank contains approximately 800-100 PSI ‚Äì this needs to be regulated down to a useable pressure. Most CO2 regulators have a screw on the front of the device which allows the outlet pressure to be set. Using a flathead screwdriver slowly adjust the pressure - turning the screw clockwise allows more pressure, while rotating the adjustment screw counter-clockwise lowers pressure. Small turns of the screw can have a big result, so be careful as you adjust.