MSA Universal Demand Flow Regulator is used to provide constant and accurate flow to the instrument pump. There is no need to manually open or close a valve for accurate calibration once attached to the calibration cylinder. The demand flow regulator is designed for use with pumped instruments and supplies the exact gas flow for the instrument pump. No ON/OFF valve is necessary because the regulator automatically turns itself off when not in use, simplifying the test and calibration process and saving calibration gas. It delivers a calibration test gas at a low rate of 0,25 lpm. The regulator threads into 34, 58 and 116L aluminum bottles and 100L steel bottles; limited to 1000 psi. The demand regulator can be used with the 5X Multigas Detector. Made in the USA.