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Double glazing can be fitted with flaps for dogs and cats to allow your pets to go and go at their own pace. They also help keep your pet's attention while you are away. It is possible to put a cat flap inside an existing uPVC panel or double glazing glass sealed unit, but you'll need a replacement piece with a premade hole. This can be done by a glazier with the appropriate equipment and experience. Easy to install Having a cat flap in your home is a great way to give your pet access to the outdoors without having you to