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Types of UPVC Door Handles When your upvc door handle requires replacement, it is essential to choose the correct replacement for your home. A locksmith can supply and fit high-security uPVC handles that come with additional security features. The most important measurements are measurement A (known as PZ) and the length of the backplate (measurement F). Make sure to check these measurements to ensure your new uPVC handle will fit. Lever/Lever A lever is a rigid bar pivoted around a