The Kitty Tube Gen 3 - Gasketed Door Awning with Removable Clear Flap Door (For Past Kitty Tube Customers to replace or upgrade their awning.) Generation 3 Kitty Tube Awning with clear removable flap door. (sold here separately) fits all existing Kitty Tubes that have a Kitty Tube logo on the side. This awning includes a gasket and is custom fit to protect the doorway of The Kitty Tube from inclement weather. Comes with removable clear flap door. The Generation 3 awning is for PAST Kitty Tube customers, since all of our Gen. 3 Kitty Tube models come with this new awning and clear flap door. This awning is an upgrade to our original awning. Comes with instructions to install.