New Age Pet Vinyl Flap Dog House DoorVinyl door provides closure for the cold months and protection from the elements all year round. Easily installs into screw bosses that are already in the New Age Pet houses. Includes large head, knurled screws that do not require tools for installation. Also includes vinyl covers to use when the door is removed to keep the screw bosses clean and ready for re-installation at a later time. Be sure to choose the correct door to fit your new age pet home. Small Fits: Small Bunkhouse and Medium Colonial models. Medium Fits: Medium Bunkhouse, medium Bungalow, large Tuff Terrace, medium Eco-Concepts and large Colonial models. Large Fits: Large Bunkhouse and large Eco-Concepts models.X-Large Fits: Extra large Bungalow and Eco-Concepts models.