Valves of metal, other than parts of machines; Junctions of metal for pipes including those from alloy steel and titanium; Metal clamps; Metal hose fittings; Metal thread adapters for use with hydraulic and pneumatic systems; Metal couplings for use with hydraulic and pneumatic systems; Metal pipe fittings; Elbows of metal for pipes; Fittings of metal for compressed air hoses; Metal hardware, namely, double-end swivels