CALGAZ GAS CANE FLOW ADJUSTER The DFR 2000 series two-stage gas casing flow adjuster is designed for use with devices that use air suction pumps for calibration. The adjuster will provide the correct amount of gas to the pump. These simple and easy-to-use adjustments make it quick and easy to adjust without the need to … Continue reading Calgaz Model DFR 2001 Gas Flow Adjuster for Gas Cylinder