Cartridge faucets have only one moving part. The stem slides up and down to open and close the faucet and rotates to regulate the flow of hot and cold water. Any leaking requires replacement of the cartridge.
First, turn off the water. To remove the cartridge, you'll need to remove the handle. This project can be like working a puzzle. If you have the manufacturer's instruction sheet for the faucet, you're ahead of the game. Without it, look for a retainer clip at the rear of the faucet just below the handle. Or, you may have to remove a set screw or snap-in "hot-cold" button and a handle pin or screw. On some faucets the swing spout must come off first. The retainer clip may be hiding beneath the handle inside a lift-out tube. Some cartridge faucets use two retainer clips–one by the handle and another by the cartridge. Retainer clips can be pried out with a screwdriver.
Once the retainer clip is removed, the cartridge simply pulls out. Use pliers, as shown. Install the new cartridge by pushing it into place with the flat arrow, or other mark upward. If you use a lubricant on the cartridge, make sure it's silicone grease.
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