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A cat flap that is built into the wall lets your pets come out and in whenever they want. Be sure not to put it too high into the wall. This can cause the loss of energy and also allow burglars to gain entry into your home. with a hole can be a challenge for future owners if you plan to sell your house. Glass cat doors offer an alternative that is safer. Easy to install A cat flap that is built into the wall is a great way to let your cat come and go whenever it wants. It's simple to set up and there are many models to choose from. Some allow you to lock