Flow control and pressure reducing regulators. The 400 (417, 418) series single-stage, piston-style regulators are designed to deliver a preset flow of non-corrosive gases in the 17 liter or 34 liter non-refillable cylinders with CGA 600 inlets. Each regulator comes with a cylinder pressure gauge. The 500 (517, 518) series regulators are single-stage, piston-style, regulators desgiend to deliver a preset flow of non-reactive and low-level reactive (less than 100 PPM)* gas mixtures from 58 liter and 103 liter non-refillable cylinders having a 5/8"-18 UNF (C-10) inlet connection. The 8000 (8C10) series regulators are used for calibration of instruments that draw the gas mixture with an internal pump. Constructed of stainless steel and aluminum, they are compatible with reactive and non-reactive gas mixtures. They supply flows of 0.1 LPM to 3.0 LPM and are suitable for use with high-pressure refillable cylinders as well as nonrefillables.