Controlling the climate of the room or rooms you are using for your indoor growing spaces is the key to getting high yields from your crops and with the right technical equipment you are in a strong position to succeed. The quality of the OptiClimate CO2 pressure reducing valve for gas cylinders is industrial grade, and it has large pressure gauges that are easy to read. It comes with a high-quality magnetic valve – the valve does not vibrate or buzz. You can make fine adjustments in increments of 1-30L/min enabling you to accurately control the climate of any room, small or large. You can obtain cheaper valves but they often do not have fine adjustment and may be fixed at 15L/min; this creates peaks in CO2 levels. The OptiClimate CO2 pressure reducing valve for gas cylinders is connected to a standard 10-12mm hose.