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You're tired of having stand up to open the door to your pet. If this is the case, a cat door could be the answer. Pet-flap fitters can put them into any kind of door including uPVC or composite doors. They can also install them in some types of wall. Security Cat flaps are usually installed on doors, but many have them installed in windows or double-glazed doors. If you don't have a wood door or wall, having one installed into glass is an excellent option. It's an excellent option for those who rent. It requires the use of a glazier, but is typical