Replacement cartridges for Moen faucets include a plastic spanner cap that allows you to twist and loosen the cartridge to make it easier to pull out. Don't be surprised if the cartridge seems stuck.

Then turn the cartridge over and replace the rubber seals. Remove the plastic disc and replace the O-ring seals under it. Inspect the faucet body holes and clean them if clogged. Beware if you ...

If you take the aerator apart, you will discover extremely small holes in round disks made of plastic ... in the valve cartridge. The owners manual that came with the faucet will show you have ...