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How to Install a Double Glazed Door Handle Installing double-glazed door handles isn't difficult If you're willing to put in the effort and possess the appropriate information. It's important to choose the right replacement handle and note the PZ and whether it's sprung or not. uPVC Door Handles There are various kinds of uPVC door handles that you can pick from, with some being more suitable for some doors than others. Some are specifically designed for aesthetic reasons,