Title: B+
Product review: We tried to install it without cutting the screen first and it wouldn't work. We have thick "pet proof" screen on our door, and even though it's not metal we had to cut the screen on the metal template. As soon as we did that it worked like a charm. I don't think the locking feature works very well. The door can be pushed right out. Instead we followed another reviews advice and installed it in the middle of the door so that we can close the glass door half way so we can stop the dogs from going out if we don't want them to, but still let the fresh air in. It was pretty simple to install, and easy for the dogs to learn to use.
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