17 NON-METAL PIPES, NON-METAL PIPE FITTINGS AND NON-METAL JUNCTIONS AND NON-METAL LINERS FOR METAL PIPES FOR PURPOSES OF PLUMBING AND CONVEYING NATURAL GAS, NAMELY, CONVEYING HOT AND COLD WATER, WASTE WATER, GEOTHERMAL WATER, SLURRIES AND SUSPENSIONS, LIQUID HYDROCARBONS, NATURAL GAS, GASEOUS FUELS, AND CHEMICAL PROCESS GAS SUCH AS WATER VAPOR CONTAINING OTHER VAPOR AND SOLIDS FOR USE IN POWER PLANTS, INDUSTRIAL HOT AND COLD WATER CONVEYANCE PIPE WORK, PUBLIC UTILITIES FOR WATER HEATING, OIL FIELD RE-INJECTION, CONVEYANCE SYSTEM FOR GASEOUS FUELS, PIPING SYSTEMS FOR CONVEYING SLURRIES, AND GEOTHERMAL PIPING SYSTEMS