Airgas Model T265F580 Brass Ultra High Purity Single Stage Pressure Regulator With 1/4" FNPT ConnectionThe unique design of this regulator provides a continuous sweeping of the high pressure chamber. This design is specifically made for processes using analyzers and mixes gases with low levels of the gas components. This sweeping action prevents any drop out or change in the gas mixture and quickly removes any contaminants that may enter the regulator. These nickel plated single stage ultra high purity regulators are recommended for non corrosive