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https://zenwriting.net/angorah....oe16/cat-flap-instal
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You could consider installing a cat flap on an upvc panel door if you want to allow your pet to enter and exit the house without fearing that they'll leave behind unwanted "gifts". This is cheaper than replacing the entire door and is simpler to install. It is possible to install an animal flap on your own uPVC doors however, it's a tricky task that could lead to costly erro