Cat and dog flaps installed in double glazing make it easy for your pets to go and come whenever they want. They also help keep your pet's attention when you are away. You can install a cat flap into an existing uPVC or double glazing sealed unit. However, you'll require https://cat-flap-installation-nea55439.yomoblog.com/37137572/installing-a-cat-flap-in-a-upvc-door-cost