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Perfect Pet Pet Door with Telescoping Frame, Medium, 7″ x 11″ Flap Size

Amazon.com Price: $32.99 (as of 04/11/2023 00:23 PST- Details)

Inner telescoping frame that adapts to doors of 1 ¼-inch to 1 ¾-inch thickness
Impact-resistant super-strong thermoplastic; Clear flap allows pet to see if slide is in place
Tamper Proof Mounting System, door can’t be removed from outside