PetSafe Wall Entry Pet Door, DIY Installation, Includes Telescoping Tunnel, M

Best option for homes where door installation isn’t possible Install into interior and exterior walls 4 3/4 in - 7 1/4 in thick Purchase a compatible extension kit to install door in walls thicker than 7 1/4 in Give your dog or cat freedom to come and go without asking for help Closing panel to control your pet’s access Energy efficient pet door Medium size for dogs up to 40 lb; flap opening measures 8 1/4 in W X 12 1/4 in H