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Title: Get 3 tunnel sections if you're putting a cat door into a wall with exterior siding
Review: Great for extending the space between the interior and exterior parts of a cat door. Though I was told 2 sections would work, you'll actually need 3 if you're going through drywall, studs, osb and vinyl siding. If you cut out the siding you could get away with two. I don't want the edging around the door though.
