FIG. 1 is a front isometric view of the diffuser;

FIG. 2 is a back isometric view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a back elevational view thereof; and,

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view that is provided for context only and forms no part of the claimed design.

The structure shown in broken lines in the drawings is for illustrative purposes only and forms no part of the claimed design.