The Blueprint Controllers® Dual Tank CO2 Regulator BCR-2 attaches to two CGA320 CO2 tank valves to regulate the flow of compressed CO2 from zero to 15 cubic feet per hour. Separate valve switches offer independent control of each tank. To maintain optimal CO2 levels in growing areas, connect the BCR-2 to a cycle timer or CO2 controller. Reliable 120-volt solenoid valve operation with a pressure gauge and flowmeter allows precise setting and adjustment. Includes two O-ring washers and 15 feet of 3/16-inch-ID tubing. Working pressure is 43.5 PSI; maximum input pressure is 4,000 PSI. One-year warranty.