The ornamental design for a dustplug for a multiport optical connection device, as shown and described.
FIG. 1 is a top perspective view of a dustplug for a multiport optical connection device showing our new design;
FIG. 2 is a bottom perspective view thereof FIG. 1;
FIG. 3 is a front view thereof of FIG. 1;
FIG. 4 is a rear view thereof of FIG. 1;
FIG. 5 is a left side view thereof of FIG. 1;
FIG. 6 is a right side view thereof of FIG. 1;
FIG. 7 is a top view thereof of FIG. 1; and,
FIG. 8 is a bottom view thereof of FIG. 1.
In FIGS. 1-8, the evenly-spaced broken lines are included for the purpose of illustrating environmental structure and form no part of the claimed design.