Provided is a tube fitment used in a fitment valve assembly having a vertical cylindrical housing and a horizontal cylindrical channel connected to each other in a T-shape, the vertical housing having a top section, a middle section, and a lower section, the top section of the housing having a front wall and a partially open back wall, where the opening is the locus for connecting a spout valve assembly; the horizontal cylindrical channel having a first opening at the first end proximate to the joint of the T-shaped tube fitment and at the top of the horizontal cylindrical channel; having an activator pin and an O-ring situated in the second section of the vertical cylindrical housing that is narrower that said first section of said vertical cylindrical housing.