Pressure Reducing and Regulating Skids for Gas and Liquid Systems EN-FAB Inc provides pressure reducing and regulating skids designed to control pressure and flow in gas and liquid systems, ensuring safe and reliable pipeline operations. In a gas distribution system, a network of transmission pipelines transports natural gas from the producing fields to consumers. Gas transmission pipelines normally operate at high pressures. As customers do not usually require gas delivered at such high pressures, it is necessary to control the pressure and flow rate.