Use the 6000 Series regulators with 58, 103 and 116 liter non-refillable cylinders with a C-10 (5/8"-18 UNF) inlet connection. They are also configured for use on returnable cylinders with pressures to 2400 PSIG. With eight flow settings from 0.1 LPM to 7 LPM, they are compatible with non-reactive and reactive gas mixtures. Use 1000 PSI gauges for non-refillable and 3000 PSI gauges for refillable cylinders.