Pipes, tubes and fittings made of metal or based on metal; flanged pipes and fittings made of metal or based on metal; road infrastructure components, cast iron manholes and gratings for roads and curbs; covers for cable ducts, rainwater pipes, ground equipment, siphon traps, rainwater gullies, liquid separators, as well as connectors, assemblies and castings for mounting, assembly, installation and repair of pipes, all these goods made of metal or based on metal, intended for conduits for underground public works and/or for sanitary or rainwater drainage systems for buildings.;