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Consider installing a cat flap on the door made of upvc for those who want to let your pet enter and exit the house without fearing that they'll leave unwelcome "gifts". This is cheaper than replacing the entire door and easier to install. While it is possible to put an animal flap inside your own uPVC door, it is important to understand that this is a tricky job and could lead to expensive mistakes. Easy to install It's important that you can allow y