Tubes, pipes and hollow profiles Tenders, Lead tubes, pipes and tube or pipe fittings Tenders, Zinc tubes, pipes and tube or pipe fittings Tenders, Tin tubes, pipes and tube or pipe fittings Tenders, Sluice gates Tenders, Tubes and pipes other than iron and steel tubes Tenders, Construction work for dams, canals, irrigation channels and aqueducts Tenders, Construction work for waterways Tenders, Canal construction Tenders