17 flexible pipes not of metal, in the nature of plastic pipe, small to large diameter polyethylene pipe, corrugated pipe, conduit pipe, and PVC pipe; non-metal fittings for pipes, in particular for plastic pipe, small to large diameter polyethylene pipe, corrugated pipe, conduit pipe, and PVC pipe; non-metal fittings for pipes for gas distribution; electrofusion fittings, namely, non-metal fittings for pipes; mechanical fittings for water and wastewater applications, namely, non-metal fittings for pipes; pipe headers, spools assemblies and sub-assemblies, namely, non-metal fittings for pipes