The large aluminum dog door is an ideal choice to offer independence and convenience for you and your pets. Premium 100% aluminum solid frame ensures longer use time than normal PVC choice, which passed bite and chew test for large dogs as well. Lightweight yet durable flap that could withstand large traffic is very suitable for multiple pets to share the same door. UV resistant design and enhanced corner are added for increased durability. A closing panel is included for you to control the access and keep home warm or cool in weatherproof.