I claim the ornamental design for an insulated backflow device cover, as shown and described.
FIG. 1 is a view taken from the front top and left end thereof: Showing my new Design, the front and right end being a mirror image of that shown.
FIG. 2 is a left side view thereof, the right view being a mirror image of that shown.
FIG. 3 is a perspective view taken from the bottom left thereof, the bottom right view being a mirror image of that shown.
FIG. 4 is a front view thereof, the rear view being a mirror image of that shown.
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a perspective view of the insulated backflow device cover shown in a position of use enclosing a backflow device.
The dark pattern along the interior surface of the insulated backflow device cover shown in FIGS. 1-3 represents a 2 dimensional surface pattern.
The broken lines shown in FIG. 6 represent portions of a backflow device and form no part of the claimed design.
The insulated backflow device cover is a thermal insulating cover for plumbing structures. The cover includes a water proof liner and outside shell made of flexible vinyl coated fiber.