Taprite 3741 Dual Gauge Beer Wine Soda Tank Mount Primary Co2 Pressure Regulator WARNING: THIS PRODUCT CONTAINS ONE OR MORE CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER AND BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM. WASH HANDS AFTER HANDLING. Use this regulator on any Co2 Tank with a CGA-320 valve. Co2 tanks have a male thread (CGA-320), these regulators have a female thread. Double Gauge Regulators Measure PSI (Pounds Per Square Inch) only. The screw in the center is used to adjust the output pressure. CO2, Plug, Primary Soda Regulator, 1P1P, CGA320 Inlet, 1/4" Flare Outlet w/Check, 160 pound and 2000 pound Gauges