GASCO Calibration Gas Cylinder Regulator, Gas Type: NON-Reactive, On/Off Type: Turn Knob, Connection Type: C-10, Flow Rate 5.3 LPM, Gauge PSI: 1500 PSI, Material: Brass, Nickel Plated, Fits Cylinders: 34L Aluminum, 58L Aluminum, 74L Aluminum, 103L Steel, 105L Aluminum, 116L Aluminum ecosmart™: 44ES Aluminum, 58ES Aluminum, 66ES Aluminum