Metal pipes; metal tubes; industrial metal hoses; fitting of metal for pipes, tubes and hoses; valves of metal for pipes, tubes and hoses; valves of metal, other than parts of machines; valves of metal, other than parts of machines, including those of steel, stainless steel, and aluminium; check valves of metal, other than parts of machines; valves of metal, other than parts of machines, for silos and storage tanks; transportable buildings of metal; prefabricated construction platforms of met...