How to replace your flap (video). David July 11, 2019 03:38 Updated Follow Watch this video for instructions on how to replace your flap. If you need help deciding which replacement flap you need Click Here. Related articles Installing your security pack (video). Which replacement flap do i need? Patio Pet Door Installation Video Installation behind your fixed glass panel (video). How Secure is the Panel? Comments 0 comments Please sign in to leave a comment.