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With a cat flap you can let your cat leave and enter your home independently. This allows your pet to move around freely and encourages exercise. It also prevents obesity and reduces boredom. Taskers can put cat flaps into wooden or uPVC doors, and some also work with wall installations. They begin by marking the area of the door, and then drilling around the corners. How do I install a Cat Flap A cat flap lets your pet to go out without you having to open the door or window. This is helpful for those who work late or worried about your cat