Pet water fountain ring filter

FIG. 1 is a perspective view of a pet water fountain ring filter.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left view thereof.

FIG. 5 is a right view thereof.

FIG. 6 is a top view thereof.

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof.

The broken line showing of FIG. 8 is for the purpose of illustrating environmental structure and forms no part of the claimed design.