How to change a washer in a tap

A dripping tap is more than just an annoyance. It wastes water and slowly adds to your water bill. In many cases, the cause is a worn-out washer inside the tap. Once this small part stops working properly, water begins to leak even when the tap is turned off.

Replacing a tap washer is a straightforward job when the instructions are clear. It can be done at home with a few basic tools and a careful approach. This guide explains each step in detail so you can stop the leak and get your tap working the way it should.

What Is a Tap Washer and Why Does It Matter?

A tap washer is a small rubber or fibre disc inside your tap that helps stop water when the tap is turned off. Every time you use the tap, the washer is pressed against the seat (the metal inside the tap body) to block the water flow.

Over time, the washer wears down or hardens. When that happens, it doesn’t seal properly anymore, and you get that annoying drip.

Changing it out can usually solve the problem without replacing the whole tap.

Common Signs You Need to Replace the Washer

Before we dive into the how-to, here are some signs your tap washer might need replacing:

• Constant dripping after turning the tap off.
  
• A squeaky handle when turning.
  
• Water is leaking from the handle base.
  
• The tap feels harder to turn than usual.
  

If you’re seeing any of these issues, there’s a good chance the washer is worn out. To learn more, read how to fix a leaking tap.

What You’ll Need

Before you get started, gather the tools and supplies below. You don’t need anything fancy—most items are common household tools.

Tools and materials:

• Adjustable spanner (or wrench)
  
• Flathead screwdriver
  
• New tap washer (check size before buying)
  
• Cloth or rag
  
• O-ring (optional, in case it’s also worn)
  
• Silicone grease (optional but helpful)
  
• A bucket or a small container
  
• Tap reseating tool (only if the seat inside the tap is rough or damaged)
  

You can find washers and tap repair kits at most hardware stores like Bunnings or Mitre 10. If you’re unsure about the washer size, bring the old one with you to match it.

Step-by-Step Guide to Changing a Tap Washer

1. Turn Off the Water Supply

This is the most important step. You need to stop the water from flowing before working on the tap.

• Look under the sink or near the tap for isolation valves and turn them off. If you can’t find them, turn off the main water supply to the house.
  
• Once the water is off, open the tap to let any remaining water drain out.
  

Place a bucket or towel under the sink in case of leftover drips.

2. Remove the Tap Handle

Next, you’ll need to take off the tap handle so you can reach the washer.

• Use a flathead screwdriver to pop off the cap on top of the tap handle (this may be labelled ‘H’ for hot or ‘C’ for cold).
  
• Unscrew the screw inside and remove the handle.
  
• You may need to gently wiggle the handle if it’s stuck.
  

3. Unscrew the Tap Bonnet

Now you’ll see the tap body (or bonnet). This is where the spanner comes in.

• Use your adjustable spanner to loosen the bonnet. It may be a bit stiff, so use steady pressure.
  
• Once loose, unscrew it by hand and lift it out.
  
• Be careful not to damage the surrounding area. Wrap a cloth around the tap if needed to protect the finish.
  

4. Remove the Old Washer

At the bottom of the tap spindle (the long part inside the tap), you’ll see the washer held in place with a small nut or simply pushed in.

• Remove the washer using your fingers or a flathead screwdriver.
  
• Check for any damage or wear. A worn washer might be cracked, flattened, or hardened.
  

This is a good time to inspect the O-ring as well. It’s a rubber ring higher up on the spindle. If it looks worn or brittle, replace it too.

5. Check the Tap Seat (Optional but Important)

Inside the tap body is a flat metal surface called the tap seat. This is what the washer presses against to stop water.

• If the seat is rough, pitted, or damaged, the new washer might not seal properly.
  
• Use a tap reseating tool to smooth out the surface if needed.
  
• You can buy one at any hardware store, and it’s easy to use. Just insert it into the tap body and gently twist to clean up the seat.
  

This step helps avoid leaks even after you’ve installed a new washer.

6. Fit the New Washer

Now, place your new washer onto the spindle.

• Make sure it sits snugly and evenly.
  
• If there’s a small nut holding it in place, tighten it gently.
  
• If the washer is a push-in type, just press it down firmly.
  

You can also apply a dab of silicone grease to make reassembly smoother and to help prevent corrosion.

7. Reassemble the Tap

Once the new washer is in, it’s time to put everything back together.

• Insert the spindle with the new washer into the tap body.
  
• Screw the bonnet back on and tighten it with the spanner.
  
• Reattach the tap handle and screw it in place.
  
• Pop the cap back on top.
  

8. Turn the Water Back On

Now turn your water supply back on.

• Open the tap slowly to test if the leak is gone.
  
• Check around the tap for any drips or leaks.
  

If all looks good, you’ve done it! Your tap is now working properly again.

Bonus Tips to Make the Job Easier

• Match the washer size exactly. If it’s too small or large, it won’t seal right.
  
• Replace O-rings too if you’ve got the tap apart anyway.
  
• Clean mineral build-up from inside the tap with vinegar if needed.
  
• Use silicone grease to keep parts moving smoothly and to prevent sticking.
  

When to Call a Plumber

If you’ve changed the washer and the tap is still leaking, it might be:

• A damaged tap seat that can’t be repaired
  
• A cracked tap body
  
• An internal part that’s beyond DIY repair
  

In these cases, it’s best to get a licensed plumber to take a look.

Final Thoughts

Changing a washer in a tap might sound like a plumbing job, but it’s one of the easiest home repairs you can do. With a few basic tools and this step-by-step guide, most homeowners in Australia can fix a leaky tap in under an hour.

Not only will you save water and money, but you’ll also get that satisfying feeling of solving the problem yourself. So next time you hear that slow drip in the middle of the night, you’ll know exactly what to do.

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