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Cats love to look out through windows, a pastime sometimes referred to as cat TV. It's a natural and entertaining pursuit that is often a form of hunting. that have a cat flap can be fitted to existing windows or doors. They can be installed in double glazing. Easy to Fit Cat flaps can be affixed to any type of glass such as patio doors, french doors, bifolds, and single-glazed windows. They are great for people who aren't keen on cutting into a wall or door and need to allow their pet to access windows.