PetSafe 2-Piece Sliding Glass Pet Door - No-Cut DIY Install Doggy Door for Renters - Aluminum Frame - Adjustable Height 75 7/8" to 81" - Ideal for Small Dogs Up to 15 lbs

Rated a star lower because the price was raised. Expensive for the materials used, it was way cheaper a few months ago when I first saw it, but fits perfectly for my balcony door. The flap is a bit heavy, my cats manage to push it most of the time but my Pomeranian puppy can’t so I removed the flap for the time being but will have to return it when it gets warmer

Its not bad. Didn’t slide that easily and some parts of the installation instructions were confusing- i didn’t do it fully correct but It does the job and cats quickly got used to the flap though sometimes they find it hard to open. I did have to purchase extra strips and seals to ensure that heat (humidity) stays out. The safety cover is great- would be even better if it didn’t need to be fully removed.