6 Metal tubes, especially in copper or in a copper alloy, for the transport of liquid, gaseous or vaporous media; sheathed metal tubes, especially in copper or in a copper alloy, for the transport of liquid, gaseous or vaporous media; accessories, namely pipe fittings for the tube systems, especially in copper or in a copper alloy for the transport of liquid gaseous or vaporous media; all used for domestic applications, namely in heating and refrigerating and in sanitary installations, namely, metal tubes for potable hot and cold water