Faucets with two handles in most bathrooms are the ones that are cartridge-style faucets.
There is a cartridge for each handle and it's a valve that turns with the handle to control how water flows into that faucet.
If there is a leak on your two-handle faucet, touch the water to know the one that has the leak.
It is the cartridge on the leaking side alone that should be replaced.
But there is also the possibility that the leak is from both sides hence, the two cartridges have to be replaced.
2 Handle Faucets Step 1: Shut off the water supply.
- Check underneath the sink for the shutoff valves on the faucet's water supply lines.
- Turn the handle of the valve for the faucet tap you're to work on in the clockwise direction till it stops.
- If there are levers on your shutoff valves in place of knobs, turn the knobs till they align perpendicularly.
2 Handle Faucets Step 2: Take off the handle of the faucet
- There are handles with setscrews behind them and others with a decorative cap.
- This cap hides the screw that holds the handle in place.
- If there is a decorative cap, use a small, flat-blade screwdriver to pry it off.
- If there is a setscrew on the faucet, use an Allen wrench to remove it.
- Pull the handle right up to take it out of the body of the faucet.
2 Handle Faucets Step 3: Take off the Retaining Nut
- Use tongue-and-groove pliers or a pipe wrench to loosen the retaining nut of the cartridge.
- Completely unscrew the nut and take it out from the faucet body.
- Pull the cartridge up to get it out of the body of the faucet.
- If the need arises, use pliers to grab the shaft atop the cartridge to pull it out.
Step 4: Fit the new cartridge
- If necessary, fasten the small brass screw atop the shaft of the cartridge.
- Use your finger to apply a little amount of plumber's grease to the O-rings of the cartridge.
- Install the new cartridge in the body of the faucet following the exact same placement as the original.
- Ensure that the tabs on the cartridge are aligned with the notches on the body of the faucet.
- Push the cartridge down to the limit in its housing.
Step 5: Finish the project
- With a wrench or pair of pliers, fasten the retaining nut to hold the cartridge in place.
- Replace the handle of the faucet as well as the setscrew or Philips screw.
- Put the decorative cap back on if there is one.
- Turn the shutoff valve on again to let water flow to the tap and check the faucet to see if it works fine.