Shower Drain Insert

FIG. 1 is a top perspective view of a shower drain insert, showing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is an elevation view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a second elevation view thereof.

The broken lines shown in the drawings depict portions of the shower drain insert that form no part of the claimed design.