CO2 -REG: The CO2 -REG controls the flow of CO2 and regulates amount of CO2 with a precision flow-gauge that can be set from 1/2 - 15 SCFH(Standard Cubic Feet per Hour). The color coded pressure gauge is easy to read and understand. Comes with a 6 ft power cord and 120 volt solenoid pre-wired. Ready to connect to a controller or a timer. Can be used with either 20lb or 50lb CO2 cylinders. The CO2 -REG reduces the pressure from the cylinder from over 2000 PSI down to 30 PSI. Brand depending on availability.