attached to valve head base 15 without penetrating or being exposed on the face 17 c of sealing member 17 this allows face 17 c to remain smooth and less prone to having food or other particles adhere thereto thereby enhancing the sanitary operation and ability to clean sealing member 17 this arrangement also allows sealing member 17 to be readily removed from and attach u00e9 dot valve head base 15 for cleaning replacement repair and or renewal in one embodiment the valve head base 15 is configured such that at least one notch or groove not shown is present in the side of the valve head base 15 in another embodiment the sealing member 17 and the valve head base 15 are configured such a notch or groove is present in the side of both the sealing member 17 and the valve head base 15 not shown in one aspect the above notches or grooves may be offset in another aspect the above notches or grooves may be in line with each other the sealing member 17 may be manipulated by the stem manipulator 19 as shown in fig1 3 manipulation of the sealing member 17 may cause the sealing member 17 to move within the valve body cavity 6 in such.