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If you're looking for a method to let your pet in and out without having to worry about them leaving unwanted "gifts" in the house you should consider purchasing an upvc door panel that has a cat flaps. This is less expensive than replacing the entire door and easier to put in. While it is possible to fit a cat flap into your own uPVC door, it's important to be aware that this is a challenging job that could lead to costly mistakes. Easy to install When you have a dog or cat in the house, it's important to be able to let them in and out of you