Abstract: A pipe nipple for the discharge of a solid water jet, particularly from the center of the shower head of a shower bath, is provided with an external screw thread on its water entry end and with two insets of which one is fitted tightly into each of the pipe nipple ends. Each inset has a number of openings for the passage therethrough of the water and a central bore for the reception of one of the axle pins of a spinner rotatably mounted between the two insets. The spinner has one or more obliquely pitched blades of a radial cross section at least equal to the cross section of the water openings in the entry end inset.