Building and construction materials and elements of metal, in particular sheets, ducting, pipes, hoses, and valves; unprocessed and semi-processed materials of metal, not specified for use, namely, common metals and their alloys; metal hardware, in particular metallic mountings, clamps, discs and fittings; structures and transportable buildings of metal, in particular bollards; parts and accessories of all the aforesaid goods, namely, metal pipes and tubes

Boiler pipes [tubes] for heating installations; flues and installations for the removal of exhaust gases; control and safety accessories for water and gas systems.