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Types of UPVC Door Handles When your upvc door handle requires replacement, it is essential to find the right replacement for your home. Locksmiths can supply and install high-security uPVC door handles with extra security features. The most important measurements are measurement A (known as PZ) and the length of the backplate (measurement F). Check these measurements to ensure the new uPVC handle will fit. Lever/Lever A lever is a solid bar that pivots around a central poin