6 Water-pipe valves of metal; manifolds of metal for pipelines; metal screws; elbows of metal for pipes; collars of metal for fastening pipes; metal nuts; ducts of metal for ventilating and air-conditioning installations; metal expansion joints for pipelines and ducts; metal expansion joints for floors and walls; metal pipes and tubes; junctions of metal for pipes, including those made of steel and titanium alloys; metal pipes for heating; metal hose fittings; metal valves, other than parts of machines, including those made of steel and titanium alloys; metal hoses for plumbing; storage and inspection metal containment and inspection boxes