the control of fluid flow through the control valve assembly 16 is accomplished by vertical sliding movement of the valve member 44 which has the reduced diameter portion 52 that interconnects the inlet passage 46 to the outlet passage 48 in the 34 on 34 position as shown in fig2 the button 22 is threaded onto a threaded portion of the upper end of the slidable valve element 44 in order to control the extent of fluid flow and has been depressed thereby aligning the reduced diameter portion 52 between the inlet passage 46 and the outlet passage 48 this feeds the warm water to the head 18 when it is desired to stop the flow of the fluid button 54 which corresponds to button 20 and is located at the other end of valve element 44 is pressed thereby sliding the valve element 44 upwardly moving the reduced diameter portion 52 out of alignment between the inlet passage 46 and the outlet passage 48 and breaking the fluid path in the 34 off 34 position with valve element 44 in the up position a major diameter portion 56 of element 44 is aligned with the inlet passage 46 and is sealed in the bore 42 at that position by o ring seals 58 and 60 this portion 56 and the o ring seals 58 and 60 above and below the inlet 46 effectively prevent any fluid flow when the valve is in the 34 on 34 position the two o ring seals 58 and 60 prevent leakage between the valve element 44 and the lower portion of the bore 42 and a third o ring.