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Are you fed up with having to climb up and down to open your doors to let your pets in? A cat flap may be the answer. Pet-flap fitters can put them into any kind of door including uPVC or composite doors. They can also put them in some types of wall. Security Cat flaps are typically used to cover doors, however many also have them installed on windows or double-glazed doors. If you don't have a wooden door or wall or window, installing one in glass is a great option. It's also a great option for those who rent.