The PetSafe Staywell Medium Dog Flap is designed to give your pet the independence they deserve while offering control and weather protection. Made with a durable aluminum outer frame and a flexible rubber flap, this pet door is built for heavy use and can accommodate multiple pets. The frame features reinforced corners for added strength. The soft, tinted flap is adjustable for your pet's comfort and convenience. It includes a magnetic flap closure and pile weather stripping to create a weather-resistant seal, keeping your home comfortable in all seasons. A closing panel is also provided for enhanced weather resistance or to manage your pet's access. This door is suitable for all doors up to a maximum of 2 inches (50mm) thick. The overall size of the door is 400mm x 277.6mm (15 3/4" x 10 15/16"), with a cutout size of 348mm x 225mm (13 3/4" x 8 7/8"). The maximum pet shoulder width it can accommodate is 213mm (8 3/8").