Double glazing can be equipped with cat and dog flaps to let your pet go and go at their own pace. They also help in keeping an eye on your pet while you are away from your home. You can put in the cat flap inside an existing uPVC or https://catflapinupvcdoorpanel44711.look4blog.com/69534859/installing-a-cat-flap-in-a-upvc-door-cost