3-Flap Dog Door, All Aluminum Alloy Large Dog Doggy Doggie Door for Wall, Telescoping Tunnel, Heavy Duty Pet Door for Dogs, Insulation Layer, 2 Magnetic Flaps, Closing Panel, for Pet Up to 110lb

Upgraded Three Flaps:We have upgraded the insulation in the center of the dog door to provide 50% more insulation than traditional insulation. Two high-quality magnetic baffles and dust burrs provide perfect insulation against cold winter winds and dust, ensuring a warm and clean indoor environment. All Aluminum Dog Door: The whole dog door is made of all high quality aluminum alloy, reinforced by high-end welding process, which is more sturdy and not easy to deform and rust.85% more durable than traditional iron and non-aluminum dog doors, extending the life of the dog door and reducing the frequency of replacement and the complexity of repetitive installation processes Two Size Dog Doors:The Large Dog Door features a ious 18.7 x 9.92 inch flap opening.It is suitable for large dogs weighing up to 110 pounds.When you make a hole in the wall, the opening in the wall measures 10.6 x 18.9 inches.It features an expandable channel that can accommodate walls from 3.95 to 7.5 inches thick.Please compare the size chart to make sure the size is right for your dog before purchase Keep You Puppy Safe at Home: Our dog door is equipped with an aluminum alloy safety lock, which is not easy to be damaged and more durable. Simply lock the sliding dog door panel to keep your puppy safe by preventing it from wandering out when you are not home. The dog door also comes with 2 pet fire and rescue stickers to notify firefighters and emergency personnel. Easy to Install: Don't worry about reading the installation instructions is too complicated. Considering the installation needs of our customers, we are equipped with a complete video of the installation process, which will be very friendly to users who do not like to read instructions.All you need to do is follow the steps to install the inner and outer sides of the dog door over the wall holes to complete the installation. Petcoming's Extra Services: Petcoming will provide all customers with additional replacement door flap if your flap are damaged and falling off.