Branching pipes made of metal; Branching tubes of metal for pipelines; Brass alloys; Common metals and their alloys; Connectors of metal for pipes; Copper alloys; Couplings and joints of metal for pipes; Metal pipes for liquid and gas transfer; Pipe couplings and joints of metal; Sheets of metal including those from alloy steel and titanium; Stainless steel; Stainless steel pipes; Stainless steels; Titanium and its alloys; Tubes of copper alloys; Tubes of metal; Water-pipes of metal; Water-pi...