FIG. 1 is an isometric view of a diffuser according to the present invention;

FIG. 2 is an elevational view of a first side of the diffuser of FIG. 1;

FIG. 3 is a front elevational view of the diffuser of FIG. 1;

FIG. 4 is an elevational view of a second side of the diffuser of FIG. 1;

FIG. 5 is a rear elevational view of the diffuser of FIG. 1;

FIG. 6 is a top plan view of the diffuser of FIG. 1; and,

FIG. 7 is a bottom elevation view of the diffuser of FIG. 1.

FIG. 7 is provided for context only and forms no part of the claimed design. All features shown in dashed lines are for context only and do not form part of the claimed design.