a high - pressure fluidjet nozzle is formed from a plurality of segments joined together , for example , by a metal sleeve . axial bores provided in the segments align to form an axial bore extending through the nozzle . the number , material , and outer and inner dimensions of the segments can be varied to provide a nozzle with desired performance characteristics . spaces can be provided between the segments to form chambers with auxiliary ports connected to the chambers to allow monitoring and modulation of the jet .