The 400 series single-stage, piston-style regulators are designed to delivery 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

Maximum inlet pressure:  500 PSIG
Inlet fitting:  CGA 600
Outlet fitting:  3/16″ hose barb
Temperature operating range:  0-140 degrees F