Flathead and Phillips screwdriver
Use it for: To remove the handle screw, trim cap, or retaining hardware.
Shop faucet repair screwdriversBathroom sink repair
How to Replace a Bathroom Sink Hot Faucet Stem
To replace a bathroom sink hot faucet stem, shut off the water, remove the hot handle, pull out the old stem, match it to the new one, install the replacement, and test for smooth shutoff without drips.
A worn hot faucet stem can cause dripping, hard turning, or a handle that no longer shuts the water off cleanly. This repair is usually manageable for a homeowner if the shutoff valves work and the faucet body is still in good shape.
Before you start: Match the replacement part to your exact bathroom sink before ordering.
Safety first
- Shut off the water before loosening any faucet parts.
- Work slowly around older faucet bodies so you do not crack brittle trim or twist supply lines.
- Use hand pressure first when starting threads to avoid cross-threading the faucet body.
- Keep small screws and trim pieces out of the drain by covering the opening with a rag.
Tools you may need
Adjustable wrench
Use it for: To loosen the packing nut or stem assembly without needing an exact wrench size.
Shop adjustable wrenches
Slip joint pliers
Use it for: To help hold trim pieces or turn stubborn parts carefully.
Shop slip-joint pliers
Allen key set
Use it for: Some faucet handles use a small set screw instead of a visible top screw.
Shop Allen key sets
Clean rag
Use it for: To protect finishes, wipe parts clean, and catch small drips.
Shop cleaning rags
Plumber's grease
Use it for: To lightly lubricate the new stem seals and threads if the replacement instructions allow it.
Shop plumber's greaseAs an Amazon Associate I earn from qualifying purchases. Repair Riot may earn a commission at no extra cost to you.
Step-by-step fix
Step 1: Make sure the hot faucet stem is the right part to replace
- Confirm the drip or poor shutoff happens only on the hot side of the bathroom sink faucet.
- Turn the hot handle off firmly but normally. If water still drips from the spout after a short pause, the hot stem is a common cause.
- Check that the handle is loose, hard to turn, or keeps spinning without shutting off cleanly. Those are also common stem failure signs.
- Look under the sink and make sure the hot shutoff valve can turn off the water to this faucet before you start.
If it works: The problem points to the hot side stem, and you have a working way to shut off the water.
If it doesn’t: If both hot and cold sides drip, or the faucet body is cracked or badly corroded, diagnose the faucet more broadly before ordering parts.
Stop if:
- The shutoff valve under the sink will not close or starts leaking when touched.
- The faucet body itself is cracked, split, or heavily corroded around the stem opening.
Step 2: Shut off water and remove the hot handle
- Close the hot shutoff valve under the sink by turning it clockwise. If needed, close both hot and cold valves so the faucet stays fully still while you work.
- Open the faucet to relieve pressure and confirm the water flow stops.
- Put a rag in the sink drain so small screws or trim pieces do not fall in.
- Remove the hot handle cap if present, then remove the handle screw or loosen the set screw.
- Lift the hot handle straight off. If it sticks, wiggle it gently instead of prying hard against the sink or trim.
If it works: The water is off and the hot handle is removed, exposing the stem area.
If it doesn’t: If the handle is stuck, apply steady hand pressure and gentle rocking. Avoid twisting hard enough to crack the handle.
Stop if:
- Water continues flowing after the shutoff valve is closed.
- The handle or faucet body starts cracking, bending, or breaking during removal.
Step 3: Remove the old hot faucet stem
- Take off any decorative trim sleeve or escutcheon covering the stem if your faucet has one.
- Use an adjustable wrench to loosen the packing nut or stem retaining nut.
- Turn the stem assembly out carefully and pull it free from the faucet body.
- Set the old stem on a rag and keep any washers, screws, or trim pieces in order so you can compare them.
- Wipe the opening in the faucet body clean so grit does not damage the new part during installation.
If it works: The old hot faucet stem is out and the faucet body opening is clean enough for the replacement.
If it doesn’t: If the stem will not break loose, use controlled pressure with the wrench and support the faucet body with your free hand to avoid stressing the sink or supply lines.
Stop if:
- The stem is seized so tightly that the faucet body twists or moves in the sink.
- The threads inside the faucet body look stripped, broken, or badly corroded.
Step 4: Match the replacement stem before installing it
- Compare the new bathroom sink hot faucet stem to the old one side by side.
- Check the overall length, thread pattern, spline or broach at the handle end, and the seat or washer end.
- Move any reusable trim piece only if it clearly matches and belongs on the new stem.
- Apply a light coat of plumber's grease to rubber sealing surfaces or moving parts if the replacement part instructions allow it.
If it works: The new stem matches the old one closely enough to install with confidence.
If it doesn’t: If the new stem does not match the old one in length, threads, or handle connection, use the old part to find the correct replacement before forcing anything together.
Stop if:
- The replacement stem does not thread in by hand or is clearly the wrong size or style.
Step 5: Install the new hot faucet stem and reassemble the handle
- Thread the new stem into the faucet body by hand first to avoid cross-threading.
- Tighten the stem assembly snugly with the wrench, then reinstall the packing nut or retaining nut if your faucet uses one.
- Reinstall any trim sleeve or escutcheon.
- Put the hot handle back on, align it properly, and reinstall the screw or set screw.
- Turn the handle gently to make sure it moves through its normal range without binding.
If it works: The new stem is installed securely and the handle is back on with normal movement.
If it doesn’t: If the stem feels crooked or binds immediately, remove it and start the threads again by hand before tightening.
Stop if:
- The stem will not thread in smoothly by hand.
- The faucet body cracks, shifts, or leaks around the stem opening during reassembly.
Step 6: Turn the water back on and verify the repair holds
- Close the faucet handle fully.
- Slowly reopen the shutoff valve under the sink and watch the faucet body, handle base, and stem area for leaks.
- Run hot water for a minute, then turn the handle off normally and watch the spout for several minutes.
- Cycle the hot handle on and off a few times to confirm smooth operation and a clean shutoff.
- Check under the sink one more time in case movement during the repair disturbed the supply connection.
If it works: The hot side shuts off cleanly, the handle works smoothly, and there are no leaks at the faucet or below the sink.
If it doesn’t: If the faucet still drips, the faucet seat, cartridge-style internals, or another internal sealing surface may also be worn and need further repair.
Stop if:
- Water leaks steadily from around the stem, faucet body, or shutoff valve after reassembly.
- The handle will not control flow correctly even though the new stem is installed.
Replacement Parts
Find a bathroom sink hot faucet stem on Amazon
Match the replacement part to your exact bathroom sink before ordering.
As an Amazon Associate I earn from qualifying purchases. Repair Riot may earn a commission at no extra cost to you.
Verify the repair
- The hot handle turns on and off without grinding, slipping, or excessive force.
- The spout stops dripping after the hot side is shut off.
- No water appears around the stem, handle base, or trim while the hot water is running.
- No leaks show under the sink after the shutoff valve is reopened.
FAQ
How do I know the hot faucet stem is bad?
A bad hot stem often causes a drip from the spout only when the hot side is shut off, a handle that is hard to turn, or a handle that no longer closes the water cleanly.
Do I need to shut off the whole house water?
Usually no. If the shutoff valve under the sink works properly, that is normally enough for this repair. If the local valve will not close, you may need to shut off the house water before continuing.
What if the new stem looks close but not exact?
Do not install a stem that does not match the old one in key details like length, threads, and handle connection. A close-looking part can still leak or damage the faucet body.
Why does the faucet still drip after I replaced the stem?
The faucet seat or another internal sealing surface may also be worn. In some faucets, replacing the stem alone will not fix a damaged seat or a badly worn faucet body.
Can I reuse the old handle and trim?
Usually yes, as long as the new stem matches the old handle connection and the trim is not cracked or distorted. Reuse only parts that fit cleanly without forcing them.