Connectors of metal for pipes; Fittings of metal for compressed air lines; Fittings of metal for furniture; Metal adapters for use with hydraulic and pneumatic systems; Metal bolts; Metal containers for compressed gas or liquid air; Metal couplings for use with hydraulic and pneumatic systems; Metal cylinders for compressed gas or liquids, sold empty; Metal hardware, namely, nuts; Metal manifolds for use with hydraulic and pneumatic systems; Metal nipples; Metal pipe couplings; Metal profiles...