the drive means 46 is provided with additional liquid outlets 68 below the roller bearings 50 with which the free space between the sleeve 56 and the drive shaft 42 communicates liquid penetrating into the sleeve 56 can exit the drive means 46 through these liquid outlets 68 the circumference of the drive means 46 is provided with two peripheral grooves 70 in which the drive belts 72 are disposed the spray rotor shown in the drawing is thereby driven via one drive belt by a neighboring spray rotor and drives the other neighboring spray rotor via the other drive belt to provide for an equilibrium of moments four peripheral grooves may be provided wherein an outer belt pair is coupled after each inner belt pair since the spray rotors 22 have identical mutual lateral separations the drive belts 72 have identical lengths the drive belts 72 surround only two spray rotors 22 and are therefore not mutually subjected to bending strain which increases their service life the lower side of the coupling element 40 has a peripheral apron 74 whose lower end is located in the region of the bottom of the liquid tub 26 when the liquid tub 26 is filled with liquid the lower edge of the apron 74 is immersed into this liquid thereby.