How strong is the Invisi Flap door? Shelly August 08, 2019 03:31 Updated The clear Invisi Flap Door is made of polycarbonate which allows the product to be relatively thin but strong. Related articles Can I install an Invisi Flap Door myself? Can I install my Invisi Flap Door into a wooden panel or door? How does the locking mechanism work? Can I install an Invisi Flap Door in my sliding door? Patio Pet Door Installation Video Comments 0 comments Please sign in to leave a comment.
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