Perfect Pet The All-Weather Energy Efficient Dog Door Energy efficient structural foam molded plastic Adjustable frame telescopes -inch to 1 -inch thickness Innovative Double Vinyl Flap design creates energy efficient air pocket for maximum insulation Optional Wall Kit, sold separately Flap Size 5-inch by 9 1/4-inch Manufacturer Warranty does not apply to product purchased through Amazon Warehouse Deals Need Assistance? E-mail Ideal Pet Products expert US-based customer care specialists seven days a week!