FIG. 1 is a perspective view of my new design for a cap shown in combination with a specimen collection vessel depicted in phantom;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a section side view of the cap of FIG. 3, taken along the 5—5 line thereof.