The C.A.P. CO2 Regulator/Emitter will allow you to maintain ideal CO2 levels for optimum growth. It features an accurate, easy to adjust CO2 flow meter, a pre-set regulator that never needs adjusting, and solenoid valve. Each unit also comes with the tubing needed to disperse the CO2 evenly throughout your room by attaching the tubing to the back of an oscillating fan for even dispersion. If you are using this without a digital CO2 controller, you will need to use a timer (The [GRASS]Grasslin Grounded Timer[/GRASS] is recommended). The flow rate is adjustable from .5 - 15 Cubic Feet Per Hour. C.A.P REG-1 CO2 Regulator and Valve - .5-15 Cubic Feet per Hour - Up to 30% faster plant growth! - Easy to Use... designed to work with any control device that is 120 volt - Fully Integrated Design that will handle almost every application - Flexible .5-15 SCFH settings - Complete with solenoid valve, 6 foot power cable and 10 feet of CO2 line - Tank Pressure Gauge - Product Condition: REG-1 - 3 Year Manufact Type: Indoor Garden Specifications: .5-15 Cubic Feet per Hour