Step-by-step fix
Step 1: Confirm the O-rings are the likely cause
- Look for water leaking from around the faucet handle, spout neck, or base rather than from the supply lines under the sink.
- Dry the faucet completely, then run the water and watch where fresh water first appears.
- Check whether the leak gets worse when you move the handle or swivel the spout, which often points to worn O-rings.
- Shut off the hot and cold shutoff valves under the sink once you are confident the leak is coming from the faucet body.
If it works: You have traced the leak to the faucet body and turned the water off at the sink.
If it doesn’t: If the leak is coming from a supply tube, shutoff valve, cracked faucet body, or loose mounting hardware, this is not the right repair path.
Stop if:- The shutoff valves will not close fully.
- The faucet body is cracked or badly corroded.
- Water is leaking from inside the wall, cabinet, or countertop opening.
Step 2: Open the faucet and reach the old O-rings
- Put a rag in the sink drain so small screws and clips do not fall in.
- Remove the handle cap if present, then remove the handle screw and lift the handle off.
- Take off any trim sleeve or retaining nut needed to expose the stem, cartridge, or spout connection.
- Pull the spout or internal part straight up if needed so you can see the old O-rings and their positions.
- Lay parts out in order on a towel so reassembly is easier.
If it works: The faucet is apart far enough to access the worn O-rings.
If it doesn’t: If a part is stuck, apply steady pressure and check again for a hidden set screw or retaining clip before forcing it.
Stop if:- A retaining clip, cartridge, or stem breaks during removal.
- You cannot access the O-rings without damaging the faucet body.
Step 3: Remove the old O-rings and clean the sealing surfaces
- Use a pick or small hook tool to lift each old O-ring out carefully.
- Avoid scratching the metal or plastic groove where the new O-ring will sit.
- Wipe away mineral deposits, old grease, and debris from the stem, spout, and O-ring grooves.
- If buildup is stubborn, keep cleaning until the surfaces feel smooth and free of grit.
- Compare the old O-rings to the new kit so you can choose the closest match in size and thickness.
If it works: The old O-rings are out and the sealing surfaces are clean and ready for new parts.
If it doesn’t: If the new kit does not match the old O-rings closely, pause and get the correct replacement before reassembling.
Stop if:- The groove is cracked, deeply pitted, or worn enough that a new O-ring will not seat properly.
- The replacement kit clearly does not fit your faucet.
Step 4: Install the new O-rings
- Apply a light coat of plumber's silicone grease to each new O-ring.
- Roll each O-ring into its groove without stretching it more than necessary.
- Make sure the O-rings sit flat and are not twisted, pinched, or riding up on one side.
- Reinstall the spout, stem, cartridge, trim, and handle in the same order you removed them.
- Tighten retaining parts snugly, but do not overtighten plastic or decorative pieces.
If it works: The new O-rings are installed and the faucet is reassembled.
If it doesn’t: If the faucet binds, will not swivel smoothly, or the handle does not seat correctly, take it back apart and check for a twisted O-ring or misaligned internal part.
Stop if:- A new O-ring tears during installation.
- A retaining nut or faucet part cracks while tightening.
Step 5: Turn the water back on and check for immediate leaks
- Open the shutoff valves slowly under the sink.
- Turn the faucet on and off several times to let pressure return gradually.
- Watch the handle area, spout base, and faucet body closely for drips or seepage.
- Wipe the faucet dry again and check a second time after a minute or two.
If it works: The faucet runs normally and stays dry around the repaired area during a short test.
If it doesn’t: If you still see leakage from the same spot, reopen the faucet and confirm the O-ring size, position, and lubrication. If the leak has moved, another seal or internal part may also be worn.
Stop if:- A supply connection under the sink starts leaking when pressure returns.
- Water sprays from a cracked faucet part or damaged connection.
Step 6: Verify the repair holds in normal use
- Use the faucet as you normally would for the next day, including hot and cold water if available.
- Check again after the faucet has been off for a while, since slow leaks often show up then.
- Run water while moving the handle and swiveling the spout if your faucet swivels.
- Look under the sink and around the countertop one last time to make sure no other leak was disturbed during the repair.
If it works: The faucet stays dry in real use, and the O-ring replacement solved the leak.
If it doesn’t: If the faucet still leaks after correct O-ring replacement, the cartridge, stem seals, spout seals, or faucet body may be the real cause.
Stop if:- Leakage continues from the faucet body after the O-rings were matched and installed correctly.
- You find hidden water damage under the sink or around the countertop opening.
Replacement Parts
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FAQ
How do I know the faucet O-rings are bad?
A worn O-ring usually causes leaking around the handle, spout neck, or base of the faucet body. If the leak is under the sink at a supply line or shutoff valve, the O-rings are probably not the issue.
Do I need to shut off the main water supply?
Usually no. For this repair, the sink's hot and cold shutoff valves are normally enough. If those valves do not close fully, you may need to shut off the main water before opening the faucet.
Can I reuse the old O-rings if they look okay?
No. Once removed, old O-rings are not worth reinstalling. They can flatten, harden, or nick easily, and that often leads to another leak soon after reassembly.
What kind of grease should I use on faucet O-rings?
Use a light coat of plumber's silicone grease. It helps the O-rings slide into place without twisting and helps protect the seal during use.
What if the faucet still leaks after I replace the O-rings?
The leak may be coming from a worn cartridge, stem seal, spout seal, cracked body, or another internal part. Recheck the O-ring fit first, then look for other worn parts in the same area.