A weak, uneven stream from your kitchen or bathroom faucet doesn’t always mean the faucet is failing. A clogged or worn aerator—the small part at the end of the spout—may be the whole problem. Replacing it is usually a quick, low-cost fix, and you can often do it with nothing more than your fingers and a towel.
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What a Faucet Aerator Does
A faucet aerator screws onto the end of a faucet spout. Inside, a screen mixes air into the water and helps shape it into a smoother stream. Many aerators also limit flow, which can reduce water use without making the faucet feel as though it has lost all its pressure.
Over time, minerals, grit, and bits of debris can collect in the screen. That buildup may make water spray sideways, pulse, or flow more slowly than usual. An aerator can also wear out, crack, or become difficult to clean. Replacing it restores the stream without requiring you to replace the entire faucet.
Before You Start: Check Whether the Aerator Is the Problem
Turn on the faucet and look closely at the stream. If it splashes, sprays in different directions, or has slowed down at that faucet only, the aerator is a sensible first thing to check. If both hot and cold water are weak at several faucets, the problem may be elsewhere, such as a partly closed shutoff valve or an issue with your home’s water supply.
To check the aerator, remove it and briefly run the faucet. Keep the stream gentle and direct it into the sink. If the water now flows strongly and evenly, the aerator is probably clogged or damaged. If the flow is still weak, look for another cause rather than buying aerators at random.
What You’ll Need
- A replacement aerator that matches your faucet
- A soft cloth or towel to protect the faucet finish
- Your fingers, or an adjustable wrench or pliers if the aerator is stuck
- A small bowl for holding the old aerator’s parts
- A flashlight or ruler, if you need help identifying the aerator
You usually don’t need plumber’s tape. Most faucet aerators seal with a small washer, not with tape around the threads. Tape can sometimes make fitting the aerator harder or cause it to sit incorrectly.
How to Replace a Faucet Aerator Step by Step
1. Protect the sink and close the drain
Put a towel in the sink or close the drain before removing anything. Aerators contain small parts that are easy to drop, and a washer can disappear down the drain in a second. The towel also protects the sink from scratches if you set down a tool.
You generally don’t need to shut off the water supply for this job. Just make sure the faucet is turned off while you work. If you’ll be running water to test the faucet later, clear the sink of tools and loose parts first.
2. Identify how the aerator is attached
Look at the end of the spout. Some aerators sit outside the spout and have visible ridges or edges you can grip. These are commonly called external or standard aerators. Other aerators sit inside the faucet opening, leaving a smooth, nearly flush edge. These recessed models are often called hidden or cache aerators and may need a special key.
That difference matters because an ordinary wrench may not grip a recessed aerator properly. If yours is hidden, check the faucet’s manual or manufacturer’s website for the correct removal key. Some faucets include a key when new; replacement keys are also sold by faucet brand or by aerator style.
3. Unscrew the old aerator
Try turning an exposed aerator counterclockwise as you look up at the faucet opening. Start by turning it gently with your fingers. If it won’t move, wrap a soft cloth around the metal and use pliers or an adjustable wrench to apply light pressure.
Don’t squeeze hard. A tool can crush the aerator or scratch a plated finish, especially on a polished or colored faucet. If mineral deposits have made it stubborn, hold a cloth dampened with white vinegar against the connection for a little while, then try again. Avoid soaking the whole faucet in vinegar, since some finishes can be damaged by acids.
4. Take note of the parts and clean the spout
Once the aerator is off, look at how its pieces are arranged. A basic model may contain a housing, a screen, and a rubber washer. More complex versions may have several screens or a flow-control insert. If you plan to reuse any part, set it in a bowl in the order you removed it.
Wipe the inside edge of the faucet spout with a clean cloth. You can also run the faucet for a few seconds to flush out loose grit, but do this gently so water doesn’t splash everywhere. Then turn the faucet off again before fitting the new aerator.
5. Match the replacement to your faucet
Faucet aerators aren’t one-size-fits-all. They differ in diameter, thread arrangement, height, and flow rate. A replacement that looks close may still fail to screw on or may leak because its washer doesn’t meet the spout properly.
If you still have the old aerator, bring it to a hardware store or compare it with the product details online. Check whether it has male or female threads, and measure its diameter if needed. In the United States, common thread sizes include 15/16-27 for many male aerators and 55/64-27 for many female aerators, but faucets vary. Recessed aerators also come in different sizes, so check the faucet brand and model when possible.
| What to check | Why it matters | How to check |
|---|---|---|
| Thread type | The aerator needs to screw onto the faucet without forcing it. | Look for threads on the outside or inside of the old aerator. |
| Diameter | A part that’s too large or too small won’t seat correctly. | Compare the old part or measure across its widest threaded area. |
| Recessed or exposed style | Hidden aerators may need a specific removal key. | Check whether the aerator sits inside the spout opening. |
| Flow rate | The rating affects how much water the faucet delivers. | Read the product label and check any local requirements. |
6. Install the new aerator
Check that the replacement has its washer in place. The washer usually sits between the aerator and the faucet spout to prevent leaks. If the old washer is stuck inside the spout, remove it before installing the new part so you don’t accidentally stack two washers together.
Start threading the new aerator by hand. Turn it clockwise and keep it straight. If it catches immediately or feels crooked, stop and back it off; forcing it can damage the threads. Once it is seated, tighten it gently by hand. If the design calls for a tool, use a cloth for protection and only a small amount of extra tightening. Over-tightening can make future removal difficult or damage the washer.
7. Test the faucet
Turn on the water slowly and check the stream. Look around the connection for drips, and see whether the water flows evenly. If it leaks at the spout, turn off the faucet and check that the aerator is straight and the washer is in place. Tighten it slightly by hand if it feels loose.
If the aerator is secure but still leaks, remove it and inspect the washer and threads. A damaged washer, wrong-size aerator, or cross-threaded connection can all cause a leak. Don’t keep tightening a part that doesn’t fit; find the correct model instead.
Should You Clean or Replace the Aerator?
If the aerator is intact and you’re happy with its flow, cleaning it may be enough. Take it apart carefully, rinse the pieces, and use an old toothbrush to loosen mineral deposits. For stubborn scale, soak removable plastic or metal parts in diluted white vinegar, then rinse them thoroughly. Check the manufacturer’s care instructions if the faucet has a delicate finish or a special aerator.
Replace the aerator if its screen is torn, its housing is cracked, the threads are damaged, or cleaning doesn’t restore a steady stream. A new aerator is also a good choice if the old one has corroded or if you want a different flow pattern. Don’t choose a lower-flow model solely because it has a low number on the package; make sure it suits the faucet’s purpose and complies with any local plumbing requirements.
Common Mistakes to Avoid
- Forcing the wrong size: If the threads don’t engage smoothly, stop. Forcing them may damage the faucet spout.
- Gripping bare metal with pliers: The jaws can leave scratches or dents. Use a soft cloth as a barrier.
- Leaving out the washer: Without the washer, water may leak around the aerator even when the threads seem tight.
- Over-tightening: A firm hand-tight fit is usually enough. Excess force can deform the washer or make the aerator hard to remove.
- Assuming every low-flow problem is the aerator: If removing it doesn’t improve the stream, check other possible causes.
Read more related posts:
- How to clean faucet aerator buildup in a bathroom? best results
- 10 DIY fixes for a leaking bathroom faucet actually work
- 10 signs your bathroom plumbing needs complete replacement right now
Frequently Asked Questions
Do I need to turn off the water to replace a faucet aerator?
No, not usually. Keep the faucet turned off while you remove and install the aerator. You can run the water briefly to test the flow once the replacement is fitted.
Which way do I turn an aerator to remove it?
For a standard threaded aerator, turn it counterclockwise as you look up at the opening from below the faucet. If it’s recessed, use the correct removal key rather than trying to grip it with pliers.
Why does my new aerator leak?
Common causes include a missing or damaged washer, a mismatched size, or threads that started at an angle. Remove the aerator, check the washer, and reinstall it straight. Don’t try to solve a poor fit by tightening it harder.
How do I know what size aerator to buy?
Compare the old aerator with the replacement, check its thread type and diameter, or look up the faucet’s brand and model. If the aerator is recessed, confirm the exact style because hidden models often need a matching size and key.
Conclusion
Replacing a faucet aerator is a simple repair when you identify the right style and size, protect the faucet finish, and install the new part without forcing it. Start by checking whether the aerator is really causing the problem, then fit the replacement with its washer in place and test for an even stream and leaks. If the flow remains weak after removal, the cause is likely somewhere else in the faucet or plumbing.
