This double-flap cat flap that is insulated provides excellent protection in all climates. It can be installed in wood, uPVC and glass doors. A tightly sealed door is vital, especially in colder weather. It keeps warm air from being sucked away and cold air from entering, saving money on energy https://catflapinstall89954.newbigblog.com/36824558/installing-a-cat-flap-in-a-upvc-door-cost