FIG. 1 is a perspective view of a chemical diffuser showing our new design, the chemical diffuser being comprised of a casing and a container;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front view of the casing of the chemical diffuser, the container removed from the chemical diffuser for ease of illustration;

FIG. 9 is a bottom plan view thereof;

FIG. 10 is a right side view thereof, the left side being a mirror image thereof;

FIG. 11 is a front view of the container of the chemical diffuser, the casing removed from the chemical diffuser for ease of illustration;

FIG. 12 is a right side view thereof, the left side view being a mirror image thereof; and,

FIG. 13 is a top plan view thereof.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design.