The invention relates to a connection method in addition to a functional part which can be used therefor and to a flame-retardant total system produced in accordance therewith. The invention relates to a method for connecting a single- or multilayer functional part (10) to a third component (20), wherein the functional part (10) has functional elements (14, 16) projecting on at least one side. Said method is characterized in that the functional part (10) is formed at least partially from a material which is at least partially transparent to laser light, and in that a blocking layer (18) is disposed so as to be at least partially opaque to laser light in such a way that after passage of the laser light through the functional part (10) the laser light inside the blocking layer (18) generates heat by absorption which is suitable for melting the functional part (10) and/or the third component (20) in order to connect them to one another in this way.

An aerator mixing rod includes a body having a first and second opposite ends and an outer surface extending between the ends. The body defines a longitudinal axis extending through the ends. The aerator mixing rod also includes teeth extending radially outward from the outer surface, with a first row of teeth and a second row of teeth spaced from the first row along the longitudinal axis. A first passageway is formed between adjacent teeth of the first row, and a second passageway is formed between adjacent teeth of the second row. The first passageway is at least partially misaligned with the second passageway in a direction parallel to the longitudinal axis such that the first passageway and the second passageway form a tortuous path for fluid flowing along the outer surface of the body. The aerator mixing rod is formed from an injection-moldable material by an injection molding process.

An aerator mixing rod includes a body having a first end, a second end opposite the first end, an outer surface, and a plurality of teeth extending radially outward from the outer surface. The teeth include a first row of teeth and a second row of teeth spaced from the first row of teeth along a longitudinal axis of the body. A first passageway is formed between adjacent teeth of the first row of teeth, and a second passageway is formed between adjacent teeth of the second row of teeth. The first passageway is at least partially misaligned with the second passageway in a direction parallel to the longitudinal axis to at least partially form a tortuous path for fluid flowing along the outer surface of the body. The aerator mixing rod is formed from an injection-moldable material by an injection molding process.