https://king-wifi.win/wiki/Cat_Flap_Installers
Cat flaps allow your pet to leave and come back as they please without you having to let them in or out. They also can help to keep your cat from having to go to the bathroom inside the house. It is much easier to put an animal flap on a Upvc panel than a glass one, but you will require some expertise and correct tools. Measure the Door Installing a cat door into a front door could be difficult, but as long as the cat flap is of the correct one and you follow the guidelines, it shouldn't be too difficult. We will show how to trace the shap