https://botdb.win/wiki/Fit_a_C....at_Flap_in_a_UPVC_Do
This double-flap insulated cat flap provides excellent protection in all climates. It can be used in wood, uPVC and glass doors. It is important to have a door that is sealed tightly, especially during colder weather. It can prevent warm air from getting sucked out and cold air from entering which can save you money on energy costs. Wind Resistance A cat flap cover for winter will help to keep your home warm by stopping cold air from entering and allowing warm air inside. Most of the best options are insulated and include a mag