Abstract: A flexible member is fabricated with four side walls forming a chamber which is coupled to a fluid source or reservoir on one side and has a slit through the end wall on the other side. The end wall is generally flat on its interior surface. Deformation of the side walls of the flexible member as by biting causes the end wall with the slit to deform and open the slit which otherwise is retained closed by the walls of the flexible member. This action establishes fluid dispensing from the source through the slit. The thickness of at least two of the side walls with respect to the slit containing end wall is greater than the end wall so that the pivoting hinge lines are established. Alternatively or in addition to the foregoing, a cut or groove into the interior of the end wall establishes a hinge line with cuts on either side of the slit thus establishing dual hinge lines.