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Double glazing can be fitted with cat and dog flaps to let your pet come and leave whenever they want. These are also great to keep an eye on your pet while you're away. You can put in a cat flap into an existing uPVC or double glazing sealed unit. However, you'll need a replacement part with an opening that is pre-made. This can be accomplished by a glazier who has the proper equipment and skills. Easy to install A cat flap is an excellent option for allowing your pet access to the outdoors without having to open and shut your doo