Presentation of goods on communication media for retail purposes; Retail store services featuring valves, sealing rings, gauges, gas analyzers, sensors, chromatographs, seals, meters, control panels and housings, custom pre-engineered metal buildings, filters, plugs and conditioning and analyzing system assemblies particularly for vapor and gas pipelines including one or more of the following components; power sources, probes, valves, flow regulators, liquid separators, pressure regulators, h...