Pipework of metal including those from alloy steel and titanium; Valves of metal other than parts of machines including those from alloy steel and titanium; Elbows of metal for pipes including those from alloy steel and titanium; Junctions of metal for pipes including those from alloy steel and titanium; Metal pipe fittings for compressed air pipes; Metal hardware, namely, double-end swivels; Metal pipe muffs; Metal pipe couplings and joints; Metal pipe connectors; Stainless steels; Aluminum ...