may take many forms a plurality of opposed aligned projections could also serve the function of the recesses 18 for example the function of the recess is to provide vertically adjustable support means for a sprayhead 20 the neck of which protrudes upwardly through a centrally disposed opening in a sprayhead crossbar 22 the opposed ends of the crossbar 22 are positioned within preselected associated opposed coplanar recesses 18 when it is desired to mount the sprayhead 20 within the cavity 8 at the preselected level fig2 shows in phantom lines the manner in which the crossbar is inserted at the preselected level the neck of the sprayhead 20 is connected by means of an elbow joint 24 and flexible pipe means to a control unit 26 best seen in fig3 the control unit 26 comprises a side outlet diverter valve 28 a flow control throttle valve 30 and a bottom outlet diverter valve 32 the valves 28 30 and 32 are connected in series between the sprayhead 20 and the source of water under pressure 34 by a flexible armored hose 36 and a custom adapter 38 if needed a sitz basin generally designated 40 and shown in perspective in fig1 is fitted about the sprayhead 20 as shown in fig2 the basin has a pair of elongate sidewalls 42 and a pair of curvilinear end walls 44 one of the end walls 44 is of concave configuration.