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Types of UPVC Door Handles If your door handle made of uPVC is in need of replacement, it's important to find the best replacement for your home. A locksmith can offer and install high-security uPVC door handles with extra security features. The most important measurements you should take are the measurement A (also known as PZ) and the length of the backplate. Take these measurements to make sure that your new uPVC handle will fit. Lever/Lever A lever is a rod that