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The Petsafe Vertical Window Pet Door will take care of that for you
Whichever situation you're in
Option of single or double flap to accommodate your insulation needs
For more on how to install a cat door replacement flap
If your screen frame is thicker than this
Draft Stopper Center Post Weatherstrip for Panels Keep Other Critters Out The Petsafe Vertical Window PetSliding glass door draft stopper for patio panel sash window pet door installations Covers gaps up to 1 1 2" wide Adheres to the frame and covers gap opening Blocks out drafts and cold air Comes in black or white Any gap that causes a draft between sliding glass doors decreases energy efficiency and lets in cold air. This sliding door draft stopper is designed to eliminate drafts and block out the cold or heat. Keep your room temperature stable with