CO2 Regulators

CO2 is stored at 800-1000 psi, but you want to dispense your beer at 8-15 psi. The regulator does the conversion for you.  A small screw on the regulator lets you adjust the output pressure, and many have a valve to cut off the flow of gas as well.  Most brewers prefer a dual gauge system.  One gauge shows the pressure of the tank, and the second shows the output pressure.