OptiClimate CO2 pressure reducing valve for gas cylinders. This product is of industrial grade quality and has large, easily legible pressure gauges. It is equipped with a high-quality magnetic valve that does not buzz or vibrate. Provided with fine adjustment in increments of 1-30L/min for accurately controlling the climate of  any room, large or small. Cheaper valves often have no fine adjustment and are fixed at 15L/min, creating peaks in CO2 levels. To be connected to a regular 10-12mm hose.