FIG. 5a is a side perspective view, FIG. 5b is a side cross-sectional view, FIG. 5c is a first end view, FIG. 5d is a second end view, FIG. 5e is a first enlarged cross-sectional view as shown along the line B-BB in FIG. 5a, FIG. 5f is a second enlarged cross-sectional view as shown along the line A-AA in FIG. 5a, and FIG. 5g is an enlarged partial side cross-sectional view a plunger cap end.