Needs 2 of these to span a typical 2" x 4" US interior wall - one was about 3/4" shorter. They're not cheap considering they're a plain are molded plastic. Two of them cost me more than the cat apartment they "extended". I also found availability in the US very limited and for the first I paid more for international shipping from the UK than enough for the liner itself.enough once the desired dimensions are calculated but it would be fairly easy for the manufacturer to give their customers a much more accurate sizing guide.Cut the liner accordingly.Overall the product met my needs but it was 1". Going deeper would have given the manufacturer the opportunity to target the US market directly and saved a lot of frustration for its US customers.-Probability!
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