This cat flap that is insulated features a double-flap design and provides a high level of protection in various climates. It can be installed in wood, uPVC and glass doors. A door that is tightly sealed is vital, especially in colder weather. It prevents warm air from being sucked away https://cat-flap-install61331.glifeblog.com/30054790/installing-a-cat-flap-in-a-upvc-door-cost