Hydrofarm CO2 emitter systems include everything needed to generate the ideal CO2 level of 1500 PPM into your growing space. 

The average level of CO2 in our atmosphere is about 300 PPM (parts per million). If that level drops below 200 PPM in an enclosed garden area, plant growth slows to a halt.

Using this CO2 Injection Kit to maintain higher PPM can not only increase plant growth rates, but flowering will also increase by 20-100%. CO2 is safe to use from seedling right through harvest.

Includes:

Precision CO2 flow meter
Brass solenoid valve
Distribution Tubing
Preset adjustable regulator with pressure gauge
Timer
Illustrated instructions

For small to medium size growing areas select 0.2 - 2 CFH (cubic feet per hour) kit, for larger than 10' x 10' areas, select the 1 - 10 CFH kit.

Carries Hydrofarm's 3 year warranty. (CO2 tank not included. They're very economical at welding supply shops.)

More info (PDF format)