Apparatus is described for subdividing a single stream of powder products entrained in a gas into a plurality of secondary streams. The apparatus comprises an array of identical ducts (33, 47) distributed over the lateral surface of a cone (34, 43) having a circular section, said ducts converging in the vicinity of the apex (35, 44) of the cone to constitute a single intake (36, 41) directed along the axis of the cone and connected to a primary intake pipe (11), said ducts being oriented along the generatrices of the cone and ending at its base in a multiplicity of orifices each connected to a secondary conduit (31) carrying one of the secondary streams.