Turn off the water supply valves to the faucet
Open the faucet to relieve pressure and let water drain
Cover the drain with a rag or stopper to prevent losing small parts
Remove the faucet handle(s)
Remove any decorative cap and loosen the handle screw/retainer
Lift off the handle and any trim pieces as needed
Remove the packing nut or retaining nut around the cartridge
Use the correct wrench or pliers to loosen and remove the cartridge retaining hardware
Pull the cartridge straight out using gentle steady force
If the cartridge is stuck, apply penetrating oil and let it sit, then carefully pull again
Remove any O-rings or seals from the old cartridge
Clean the cartridge seat and interior housing of mineral deposits and debris
Inspect the seat for damage and replace parts if needed
Install new cartridge (ensure correct orientation/alignment)
Replace O-rings/seals (or install the new ones included with the cartridge kit)
Lubricate O-rings with plumber’s grease if included/recommended by the kit
Reinsert the cartridge fully into the valve body
Reinstall the retaining nut/packing nut
Reinstall trim pieces and handle
Tighten handle screw/retainer and replace decorative cap
Turn on water supply valves
Open the faucet and check for leaks around the handle and base
If leaks occur, shut off water and recheck cartridge seating and O-rings
Flush the faucet by running hot and cold for a short time to clear debris