
Product fits perfectly and works well but does not perform the most important function - it holds the door securely and securely. If you're thinking this works like a regular sliding dog door (which slides right up to the frame and is almost airtight), you're wrong. After you install these rails you will have a 0.5 to 0.75 inch gap between the dog flap and the cover that you will insert between these rails. I bought this so nothing can open the door at night and I don't have to lock the door. each night. Also, I thought it would be more energy efficient. The only thing this extra feature doesn't miss is other dogs or cats. If a snake were to sneak up on the dog door with the feature on, it could push the dog door far enough to get in, as the dog door can open about 1 inch when in place. This is useless unless you are trying to keep dogs/cats inside or outside. Also, it looks horrible once installed as it protrudes 2 inches out of the door once installed. Too expensive for its features.

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