Sight Glass

FIG. 1 is a top perspective view of an embodiment of a sight glass showing a new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top perspective view thereof.

The broken lines depict environmental structures that form no part of the claimed design.

The dash-dot-dash lines depict boundaries of enlarged views that form no part of the claimed design.