Abstract: A system for use in a structure for refilling portable self-contained breathing apparatus comprising a plurality of stations including a first station, an intermediate station and an end station, apparatus for coupling the first station to a source of compressed air, tubing for conducting compressed air from said first station to said intermediate and end stations and apparatus at each of said stations above or downstream from said first station for coupling said compressed air to said portable self-contained breathing apparatus. Air pressure indicators and valves for isolating an upstream station from a downstream station are also provided in each station.