|  Double-flap system insulates for energy efficiency. Easy do-it-yourself installation kit. Aluminum frame with durable plastic tunnel extension. Telescoping tunnel allows for installation into walls. Extension kit sold separately to extend beyond 7.25 . Fits walls 4.75 to 7.25 thick. Dimensions - 9.75 x 13.5 . Flap Opening Dimensions - 5 x 7 . Great for pets up to 12lbs.
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