Rigid pipes, not of metal, for building; drainpipes for building, not of metal; plastic conduits for irrigation; chimney pots, not of metal; plastic conduits for drainage and irrigation; plastic conduits for drainage; rigid gas pipes, not of metal; rigid underdrainage pipes, not of metal; rigid pipes, not of metal; gutter pipes, not of metal; non-metallic drainage pipes; water-pipes, not of metal; rigid penstock pipes, not of metal; sewer pipes, not of metal; plastic gutter pipes; rigid plast...