Replacing the internal cartridge in a Delta bathroom faucet is a straightforward DIY repair that requires shutting off the water supply under the sink, plugging the drain to prevent lost hardware, and removing the handle by loosening its set screw. Carefully remove the decorative cap, unscrew the retaining nut or cap assembly, and pull the old cartridge straight out of the valve body. Clean any accumulated mineral scale from the interior chamber, insert the new genuine Delta replacement cartridge, and reassemble the handle.
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