Branching pipes, not of metal; sandstone pipes; gutter pipes, not of metal; drain pipes, not of metal; rigid pipes, not of metal, for building; drain traps [valves], not of metal or plastic; water-pipe valves, not of metal or plastic; tanks of masonry; building materials, not of metal; pitch, tar, bitumen and asphalt; non-metallic transportable structures; monuments, not of metal.