Premium Double Gauge CO2 Regulator - Polycarbonate Bonnet Commercial Dual Gauge Design with A 60 Psi and 2000 Psi Gauge Low Pressure Gauge. Primary Keg Beer Regulator 5/16 barb Shutoff with Check Valve Ball Check Valve. Gray Plastic Bonnet for Easy Pressure Adjustment. Co2 Keg Brass Beer Double Gauge Regulator.