Gas Flowmeter, Low Flow Rate, CO2, 22-220mL / Minute. Gas flowmeters for use with CHEMcell Rocker Bioreactor System, CLS-1200-series. Inlet and outlet connections are made via 1/4" hose barb fittings. Gas must be dried, filtered and regulated to less than 15psi. Flowmeters also include a triangular base with leveling feet.