How to Stop A Dripping Tap – 

Plumber’s Guide to Replacing Washers and Servicing Taps

Don’t let a dripping tap keep you up at night! Left unattended, leaking taps can quickly escalate to a significant leak, higher water bills, and potential water damage. Replacing a washer might seem simple, but correctly servicing a tap involves more than just swapping out a part. Attempting a DIY fix without proper knowledge, experience, and equipment can lead to unforeseen complications and extra costs.

This guide will outline the correct steps to service taps, highlight common pitfalls of DIY attempts, and explain why it’s usually best to call a professional plumber. By understanding the process, you can ensure a successful outcome without any unpleasant surprises.

Please note: The information provided in this blog is general in nature and may not cover all details relevant to your specific circumstances. Plumbing regulations vary by state and region; for instance, in Brisbane, Queensland as of 2024, the QBCC states that changing a tap washer is considered unlicensed work. However, properly servicing a tap often requires additional steps, such as re-seating the combination, which are not mentioned as unlicensed activities. We recommend checking with your local authorities to confirm what tasks you are permitted to perform.

Always use all equipment, including personal protective equipment (PPE), safely and according to the manufacturer’s instructions, ensuring they are suitable for the task and fit properly. To ensure the work is done correctly, avoid any unexpected issues, and maintain warranty conditions, don’t risk it—use a licensed plumber.

We disclaim any liability for losses or damages resulting from the use of this information.

What Causes Taps to Leak?

Several factors can contribute to a leaking tap:

• Worn-Out Washers: Over time, washers can perish and fail to seal properly.
• The Age and Condition of the Seat: If the brass seat (the part that the tap screws into) is worn or damaged, it can cause leaks.
• High Water Pressure: Excessive pressure can drastically shorten the life of tap components.
• Old Taps: Stiff ageing taps may create extra friction and be more prone to leaks.
• Usage Issues: Turning taps off too tightly can damage the jumper valve; not tightening enough can erode the seat.

An example of a Damaged Seat causing taps to leak.

What Are The Different Parts of a Tap?

Before you begin, it’s essential to know the different parts of a standard tap:

• Buttons: The end caps that cover the screw holding the handle.
• Handles: The part you turn to control water flow.
• Flange: The bevelled cover that seals against the wall to cover spindles and stop water from flowing behind the tap.
• Spindles: The mechanism inside the tap that moves to open or close water flow.
• Seat: The area in the combination where the washer seals to stop water flow.
• Washers: Replaceable rubbers and plastic components that allow taps to seal.
• Combination: The assembly of parts that the spindles screw into. This is made of brass and copper pipes.

Note: This guide focuses on standard taps. For ceramic disc taps and mixer taps, scroll to the bottom of the article.

Tools and Materials Needed

To service your taps, you’ll need:

• Shifter (Adjustable Wrench)
• Multi-Grips
• Small Flathead Screwdriver (for removing the o-ring and body washer)
• Needle-nosed pliers (for removing the jumper valve)
• Re-seating Drill Bit (for polishing the seat)
• Electric Drill (Do NOT use a hammer drill)
• Silicone Gun
• 2 Quality Jumper Valves
• 2 Quality O-Rings
• 2 Quality Body Washers
• White Bathroom Silicone
• Thread Tape
• Tap Grease
• Rags

Important: Using high-quality washers ensures durability and prevents future leaks.

Step-by-Step Guide to Changing a Tap Washer

Step 1: Isolate the Water Supply

Before starting any plumbing work, the first step is to turn off your water supply.

• Locate Your Water Meter Box: Typically found at the front of your property.
• Turn Off the Isolation Valve: Rotate clockwise to shut off water flow.
• Test the Water Is Off: Turn on another hot and cold tap to ensure no water runs.

Note: In some unit blocks, the cold-water isolation valve may not isolate the hot water.

For more information, refer to our blog on How To Isolate Your Water Supply  

An example of a water meter box. Inside this box will be an isolation valve you can turn clockwise to isolate.

Step 2: Remove the Taps

• Remove Handles and Buttons: Use a screwdriver to pry off buttons and unscrew handles.
• Unscrew Flanges: Gently attempt to unscrew flanges by hand. If stuck, there are specialised tools available to minimise the chance of damaging the tapware. You can also use multi-grips with a rag to protect the chrome finish.
• Remove Spindles: Cut away any silicone and unscrew spindles from the combination.

An example of shower tapware removed from the wall.

Step 3: Replace the Washers

• Disassemble Spindles: Unwind to access the O-ring.
• Replace Components:
  • Jumper Valves
  • O-Rings
  • Body Washers
• Apply Tap Grease: Coat spindles for smooth operation and to prevent over-tightening.

Example of a set of taps following washer replacement and lubrication

Example of the difference in quality between Jumper Valves.

Step 4: Reseat the Combination

Depending on where you live, this step may be considered licenced plumbing work. It also requires specialised tools and knowledge. If it is not done correctly, it can damage the seat and require a shower renovation to resolve. Don’t risk it—use a licenced plumber

• Inspect the Seat: Look for corrosion, cracks, or warping.
• Reseating Process:
  • Attach the re-seating drill bit to your electric drill.
  • Carefully grind the seat to create a smooth surface.

Warning: Do NOT use a hammer drill. Incorrect use can cause significant damage. We do not recommend trying this step without the supervision of a licenced plumber. If this is not done correctly, it can potentially cause substantial damage.

Example of a seat after re-seating. This creates a good surface against which the jumper valve can seal.

Step 5: Reinstall and Seal the Taps

• Reinstall Spindles: Wind the tap to the open position before installing.
• Apply Silicone: Seal around where spindles enter the wall to prevent water ingress.
• Reassemble Taps: Replace flanges, handles, and buttons.

Example of taps with silicone behind the flanges to prevent water tracking into the wall cavity.

Step 6: Restore the Water Supply

• Remove the Shower Head: This allows debris and shavings to be flushed through the line without getting stuck in the shower head.
• Flush Out Debris: Partially turn on the isolation valve by slowly turning it anticlockwise to flush out any shavings.
• Turn the Isolation Valve on Fully: Continue turning it anticlockwise until it’s fully open.
• Check for Leaks: Test the serviced taps and ensure they function correctly.