The 411 Series regulator provides primary pressure control for non-corrosive, ultra-high purity, or liquified gases in applications requiring constant pressure control and delivery regardless of supply pressure variation. Two stages of pressure regulation minimize pressure variation arising from inlet pressure changes, such as the depletion of the supply cylinder. Available with a variety of options installed at the factory, the CONCOA 411 Series regulator may be configured as a single station manifold with or without purge, low-pressure alarm, or multiple inlets.