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A cat flap allows you to allow your pet to roam more freely without the headache of having to let them in and out. It can also help your pet to be less stressed and stop them from coming into the home when they're not welcomed. To install a cat flap, measure the distance from the bottom of the cat's stomach to the floor. Mark a line along the door's panel. Utilize a spirit-level to ensure that the line is straight. 1. The kind of door If you're installing the cat flap to a uPVC door panel or double glazing glas