US D856,477 S1 · Device for preventing sewer backflow

Abstract

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Dependent claims

I claim the ornamental design for a device for preventing sewer backflow, as shown and described.

Brief description of the drawings8 figures

#FIG. 1 is a perspective front, top and right side view of a device for preventing sewer backflow;

#FIG. 2 is a perspective front, bottom and right side view of the device for preventing sewer backflow of FIG. 1;

#FIG. 3 is a top plan view of the device for preventing sewer backflow of FIG. 1;