FIG. 1 is a top plan view of a blood gas syringe stopper, showing my new design;

FIG. 2 is a side view;

FIG. 3 is a bottom plan view;

FIG. 4 is a front isometric view;

FIG. 5 is a rear isometric view; and

FIG. 6 is a sectional view of line 6--6 of FIG. 1.

The broken lines are shown for illustrative purposes only.