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How to Install a Double Glazed Door Handle Installing double glazing door handles isn't difficult when you are willing to put in some effort and possess the appropriate information. It's important to ensure you pick the correct replacement handle, and keep track of the PZ and whether or not it's sprung. uPVC Door Handles There are many varieties of uPVC handles to choose from, some more suitable for specific doors than others. Some are specifically designed for aesthetic reasons, while others are more security-focused. Ce