Device for preventing sewer backflow

<figref idref="DRAWINGS">FIG. 1</figref> is a perspective front, top and right side view of a device for preventing sewer backflow;

<figref idref="DRAWINGS">FIG. 2</figref> is a perspective front, bottom and right side view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>;

<figref idref="DRAWINGS">FIG. 3</figref> is a top plan view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>;

<figref idref="DRAWINGS">FIG. 4</figref> is a bottom plan view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>;

<figref idref="DRAWINGS">FIG. 5</figref> is a right side elevational view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>;

<figref idref="DRAWINGS">FIG. 6</figref> is a front elevational view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>;

<figref idref="DRAWINGS">FIG. 7</figref> is a left side elevational view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>; and,

<figref idref="DRAWINGS">FIG. 8</figref> is a rear elevational view of the device for preventing sewer backflow of <figref idref="DRAWINGS">FIG. 1</figref>.

The broken lines shown in the drawings are for the purpose of illustrating portions of the device for preventing sewer backflow and form no part of the claimed design.