Aquatic Life CO2 Regulator with Lighted Solenoid Bottle Pressure Gauge: 3,500 PSI Max-Reduced Pressure Gauge: 140 PSI Max Solenoid: 120 Volts-Power Cord: 2 Meters Connection: Female CGA 320-CO2 Line-Out Connection: 1/4" Compression Fine Adjustment: Needle Valve