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https://writeablog.net/hornver....se61/using-upvc-cat-
If you're looking for an option to let your pet in and out without worrying about them leaving unwelcome "gifts" within the home you should consider purchasing a door panel made of upvc with a cat flap fitted. This option is cheaper than replacing the entire door and easier to install. Although it is possible to install an animal flap inside your own uPVC door, it's important to understand that this is a difficult job that could lead to costly mistakes. Easy to install It