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How to Install a Double Glazed Door Handle Installing double-glazed door handles isn't difficult when you are willing to put in some effort and have the necessary knowledge. It's important to ensure that you select the right replacement handle and note of the PZ as well as whether or not it's sprung. uPVC Door Handles There are many different types of uPVC handles that are available, some more suitable for specific doors than others. are specifically designed to be more secure, while others are primarily for