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A upvc panel cat flap lets your cats come and leave as they please. The installation is a three-step process that can be done on glass doors, wooden doors panels or UPVC panels. It is a great choice for those who want to ensure their pets' safety and also save money on energy. UPVC panels are resistant to heat, moisture, and UV. Easy to install Installing a pet flap over your glass door or glass panel is a great idea if you have a cat. is a great solution