Key for a water filter assembly

FIG. 1 is a top perspective view of a portion of a water filter assembly having a key;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof, the rear view being a mirror image of same;

FIG. 4 is a left side elevation view thereof; and,

FIG. 5 is a right side elevation view thereof.

The subject matter shown in broken lines is not considered part of the claimed design.

The ornamental design for a key for a water filter assembly, as shown and described.

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