The invention relates to a sanitary component, namely a stream regulator or stream former for flowing fluid media, consisting of property-defining components in a sandwich-like arrangement in the direction of flow which comprise at least one screen attachment, one diffuser plate assembly as well as a shell body having segments of stream-forming openings extending across its cross-sectional surface. The property-defining components are exchangeable and combinable so as to realize adaptability to different user and user requirements. A locking means is provided e.g. on the inner circumference of the shell body for this purpose as is a corresponding counter-locking means on the outer circumference of the diffuser plate assembly. The diffuser plate assembly exhibits, at least on its exterior, a flow rate class-specifying optical code and the shell body exhibits a stream type-specifying, namely laminar or aerated, optical code. The screen attachment is furthermore inserted into a circumferential inner recess of the e.g. circular diffuser plate assembly, preferably by means of a locking connection, whereby in the case of a flow regulator disposed between the screen attachment and the diffuser plate assembly, the screen attachment is of translucent or transparent design and the flow regulator exhibits another optical coding. In the case where no flow regulator is provided, the optical coding of the screen attachment is designed to match that of the diffuser plate assembly or be provided in a predefined combination.