Finding the correct replacement faucet cartridge requires systematic disassembly, visual comparison, and brand identification. First, shut off the water supply valves under the sink, plug the drain to prevent losing small parts, and remove the handle by loosening its set screw or popping off the decorative cap. Carefully extract the retaining clip, pull the old cartridge straight out using pliers or a specialized pulling tool, and examine its physical shape and stem configuration. You can then match your extracted part against manufacturer catalogs or bring the physical cartridge to a plumbing supply store.
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