Weatherproof Dog Door with Sliding Lock Panel, Tunnel Adjustable, Double Flap Do

Weatherproof Dog Door with Sliding Lock Panel, Tunnel Adjustable, Double Flap Dog Door and Cat Door, Strong and Durable, for Medium 【FLEXIBLE SIZE】 Fits paneled, wood, PVC and metal doors 1 3/8'' - 2 1/8'' thick, and is designed for pets up to 40 pounds. External size: 11 1/4''(W) x 15 5/8''(H), Flap Opening is 8 7/8”(W) x 12 1/4''(H) 【ALUMINUM FRAME】 HARDLIGHT dog doors for large dogs are made out of Durable Sturdy Aluminum material that is proven to be sturdy and stainless. Don't worry about breaking and bitten easily 【ENERGY SAVING】Magnetic Flaps designed to enable the door plate to quickly reset after being lifted. Perfect for hot and cold climates improve energy efficiency and help protect against extreme weather 【SECURITY LOCKING】Two locking panels are included in a large dog door, which can not only double protect the security of the home but also reduce heat transfer in rough weather, and keep other unwanted visitors out of the house 【EASY INSTALLATION】HARDLIGHT Pet Door can be easily installed with the provided cutting template and installation guide. No need to plan your schedule around potty breaks, your four-legged friends can come and go on their time