Active Air CO2 System with Timer

Deliver growth-boosting CO2 with the user-friendly, Active Air's easy to operate CO2 System. With its programmable timer, it will automatically maintain ideal CO2 levels for optimum growth. For small to medium size areas, select the COSYS; for larger than 10' x 10' areas, select the COSYS20. Note: Current COSYS & COSYS20 now come equipped with a black rubber O-ring that has replaced the white plastic washer.