Calgaz has variety of 2000 series regulator which are available in different material and inlet size. The Demand Flow Regulator is designed to work with pumped instruments. The regulator enables gas to flow when a vacuum exceeding 3” water gauge (746 Pa) is pulled by the instrument. The regulator allows the calibration gas to flow at the rate required by the instrument, automatically cutting off the flow when the instrument is switched off. The range is 0 to 3 LPM which depend on model. It is compatible to all Calgaz gas cylinders.