Castings, foils, powder, and rolled, drawn or extruded semi-finished articles of tin or its alloys; Manually operated metal valves; Metal adapters for use with hydraulic and pneumatic systems; Metal air conditioning ducts; Metal clamps; Metal flanges; Metal pipe fittings; Metal pipes and metal fittings therefor; Metal pipes for liquid and gas transfer; Pipe coupling of metal; Steel pipes and tubes; Water-pipe valves of metal; Water-pipes of metal