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Double glazing can be fitted with flaps for dogs and cats to let your pet go and go at their own pace. They also help in keeping an eye on your pet when you are away from your home. You can put in a cat flap in an existing uPVC or double glazing sealed unit. However, you will require a new part with a premade opening. A glazier is able to do this with the proper equipment and training. 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 const