The jet can be mounted in the wall of a pipe or hose and consists of a tube with throughflow channel opposite which a circular disc (22) is mounted against which the water jet (W) from the tube is directed.The surface (24) of the disc (22) is conical so that the water jet is directed outward where it hits the shoulder (25) of a rim (26) which further breaks up the water jet. The shoulder (25) lies at a short distance (a) from the outside of the water jet.
