Casings of metal for oilwells; Elbows of metal for pipes; Junctions of metal for pipes; Manifolds of metal for pipelines; Manually operated metal valves; Metal containers for compressed gas or liquid air; Metal hardware, namely, springs; Metal valves not being parts of machines; Metallic drain traps; Nuts of metal; Pipes and tubes of metal; Pipework of metal; Reinforcing materials of metal for pipes; Steel pipes and tubes; Water-pipe valves of metal