valve seat 70 and an outlet or discharge passage 84 above the valve location the inlet passages 82 are connected individually to the conduits 18 26 and the discharge passages are connected to supply fluids to the interior of head 14 the valve seal structure of the present invention is a shear seal having contoured seats and a flat seal element this seal configuration results in a significant reduction of sticking friction and creates a snap type opening effect which has good sealing characteristics and requires low spring forces to effect good sealing thus when an operating button is pushed to operate the valve the valve operates easily and quickly and the valve return springs 73 may be very light springs still referring to the structure of fig5 a portion of small diameter stem 64 projects above retainer plate 80 and the valve operating buttons are mounted on this portion of each stem with a mild friction fit as seen in fig5 soda button 32 is mounted on the stem of the center valve and syrup buttons 38 and 42 are mounted on the valve stems on either side of the soda button 32 these operating buttons are retained in place by retainer 30 which defines a hollow interior operating space 92 an activating bridge 94 extends from each of the syrup buttons 38 and 42 below retainer plate 30 and each of these activating bridges overlaps an annular operating ring 96 on soda button 32 thus when operating force is applied to either syrup button 38 or syrup button 42 to move the button and valve downward to operate the syrup valve activating bridge 94 engages.