supplied centrally and or within the stream 100 of the fresh water fig7 shows variants of a connecting piece 20 placed on a wash basin 10 having integrated water outlet and sensors fig7 a shows an armature having two sensors s 1 s 2 optical ultrasound pyro etc for determining the presence and the position of the hands in the wash basin fig7 b shows a first armature having especially preferred integrated sensors for generating an optical field four cells are positioned on the connecting piece 20 specifically two transmitters e 1 e 2 and two receivers r 1 r 2 cf also fig9 in which these cells are positioned in the basin wall 14 for this capacitive solution these cells essentially comprise four plates fig7 c shows a further armature having integrated sensors for generating an electrical field the four cells e 1 and r 1 and e 2 and r 2 respectively being positioned in a collar at the foot of the connecting piece and generating and or monitoring the fields a 1 a 2 and or their overlap region a 3 alternatively to what is shown in fig7 the intake connecting piece 20 may also be positioned in a wall 1 on which the wash basin 10 is positioned over the basin 12 the cells e 1 r 1 and or e 2 r 2 cf also fig9 for generating an electrical or optical field are then preferably also positioned to the left and right of the intake connecting piece.