Active Air-Timer Size:Hydrofarm CO2 (1-20 cu ft per hour) with Timer 8 barbed ports that connect

8 barbed ports that connect to 1/4” OD Tubing

A sure way to unhappy

select plant-based esters

chloramine

bacterial leaf blights

Active Air-Timer Size:Hydrofarm CO2 (1-20 cu ft per hour) with Timer 8 barbed ports that connectDeliver growth boosting CO2 with our user friendly, easy to operate 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. To use Hydrofarm's CO2 Flow Rate Calculator, click HERE NOTE: Current COSYS & COSYS20 now come equipped with a black rubber O ring that has replaced the white plastic washer.