channel for the passage of the continuous filament yarn 1 at the inlet point 18 an annular gap forms a drive jet 47 through which compressed air is introduced into the yarn channel 45 the compressed air is introduced from a source not shown via a chamber 48 and one or more bores 49 in the body 41 into the annular space 48 39 a high pressure air jet is orientated by the drive jet 47 through the inlet point 18 into the bore 45 a suction annular gap 50 and annular channel 52 which opens into the conical bore 46 is formed between the lower end of the body 42 and the upper side of the plate 43 a vacuum is produced at this point by the downwardly directed airstream as the narrowest cross sectional area of the bore 46 is greater in the plate 43 than the outlet cross section of the supersonic jet channel 17 staple fibers 2 can be introduced into the suction zone 46 through the second annular gap 50 however it is also possible to introduce staple fibers or a second filament through a further bore 70 39 fig9 is a longitudinal section through the core element of a third embodiment of the air jet texturing unit 4 according to fig9 a body 61 contains a elongate bore 64 which opens.