How do I perform a Moen 1225 cartridge replacement in my faucet?

To perform a Moen 1225 cartridge replacement in your faucet, first turn off the water supply. Remove the handle and trim to access the cartridge. Use pliers to pull out the old cartridge and insert the new one in the same orientation. Reassemble the faucet and turn the water supply back on to test for leaks.