Abstract: A one piece closure has a distal section, a proximal section, and an intermediate section. The intermediate section has a cylindrical center with a first annular fold extending radially inwardly and a second annular fold extending radially inwardly. The first and second folds are parallel forming an annular channel there between extending for less than 360 degrees creating a gap. The cylindrical center is formed with a hole. A C-shaped snap ring is positioned within the annular channel. The snap ring has spaced free ends. The snap ring has a projection sized to extend into the hole in the cylindrical center. The projection of the snap ring is of a first color. The remainder of the snap ring is of a second color.