Special order 
The Blueprint Controllers® CO2 Generator LP, CGLP-2 features two preinstalled brass burners that generate 5.3 cubic feet per hour of CO2 using liquid propane. The removable second burner makes it easy to reduce the CO2 and heat output to suit a smaller growing space. Electronic ignition and dual solenoid valves eliminate the open pilot flame and provide safe, reliable starts. A safety tip-over switch automatically stops gas supply to the burners if the unit is not upright. The unit includes gas regulator, 12-foot hose, hanging hardware and a three-year warranty.