https://postheaven.net/degreel....yre5/choosing-cat-fl
https://peters-hay.technetblog....gers.de/installing-a
Cat and dog flaps installed in double-glazed units allow your pets to come and go whenever they want. They also help in keeping an eye on your pet whilst you are away from home. You can put in a cat flap into an existing uPVC or double glazing sealed unit. However, you'll require a replacement part that has an opening that is pre-made. A glazier is able to do this with the proper equipment and the right training. Easy to install A