
Changing basin taps in Australia is a relatively straightforward process, but it can be challenging if the taps are old, rusted, or seized. Before starting, ensure you have the necessary tools and components, such as a monobloc tap spanner set, mounting hardware, and the new mixer. Begin by turning off the water supply and clearing the work area. Then, remove the old tap by unscrewing and lifting it out of the basin. Clean the area, assemble the new mixer, and attach any hoses or fittings. Insert the new mixer into the basin, secure it with mounting hardware, and tighten the nuts with a wrench. Finally, apply sealant around the base of the mixer and test the water flow and temperature. If any issues arise, such as leaking connections, adjust the fittings or reapply Teflon tape.
| Characteristics | Values |
|---|---|
| Difficulty | Changing basin taps is usually straightforward. However, it can be challenging to remove old, rusted, or seized taps. |
| Tools | Basin wrench, monobloc tap spanner set, standard tap back-nut box spanner, adjustable spanner, screwdriver, plumber's tape/Teflon tape, bucket, cloth |
| Types of taps | Basin mixer taps, single basin taps (separate hot and cold), bath taps, laundry taps, wall-mounted taps, deck-mounted taps, pillar taps, monobloc taps |
| Considerations | Ensure the tap fits the sink and the holes on the sink match the tap's hole spacing. Consider the tap's shape and mechanism, such as single or double-handle options. |
| Common issues | Leaking connections, dripping taps, corrosion, water damage |
| Tips | Turn off the water supply before starting work. Clear the work area and place a bucket underneath to catch any residual water. Follow the manufacturer's instructions for assembly. |
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What You'll Learn

Turn off the water supply
Turning off the water supply is the first step when changing basin taps. This is to avoid any unwanted indoor waterfalls. Typically, this involves shutting off the valves under the sink. If your setup doesn’t have individual shut-off valves, you might need to turn off the main water supply to the house.
After shutting off the valves, turn on the tap to ensure no water is flowing before you proceed. This ensures there's no water pressure in the pipes when you begin your work.
If you have a basin mixer tap, you will need a monobloc tap spanner set as the nuts are always a different size, typically between 8 and 13 mm. A standard tap back-nut box spanner is 27 mm at one end and 32 mm at the other. The 27 mm end will be suitable for changing single basin taps (separate hot and cold taps), and the 32 mm end will be suitable for changing bath taps.
If there are no flexible tap connectors on the old taps, then you will also need a 15 mm pipe cutter to cut the pipes and fit isolation valves for the new flexible tap connectors to connect to.
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Remove the old tap
Before you begin, turn off the water supply to avoid any unwanted spills. Typically, this involves shutting off the valves under the sink. If your setup doesn’t have individual shut-off valves, you might need to turn off the main water supply to the house.
Now, let's get started on removing that old tap. Firstly, turn on the tap to let any remaining water drain out. This ensures there's no water pressure in the pipes when you start work. If your tap is dripping, you may be able to fix it instead of replacing it. For example, if you have a full-turn tap, you can try changing the tap washer. However, if your tap is old, rusted, or seized, it may be more difficult to remove than a newer tap.
Next, you'll need to remove the mounting nuts holding the tap in place. These can be very tight, so if your adjustable spanners aren't doing the job, try a large red stilson or a basin wrench. You can also try applying some gentle pressure to loosen the tap. Once the nuts are off, you should be able to lift the tap out of the basin. If you're replacing the whole basin assembly, you may need to use a tap spanner to remove the spindle.
Finally, clean the area where the old tap was installed. This means removing any old silicon or sealant to ensure a smooth surface for your new tap.
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Clean the area
If your tap is dripping, you may be able to fix it instead of replacing it. For example, if you have a full-turn tap, you can try changing the tap washer. To do this, first, remove the tap cartridge, then replace the washer with an identical one, and finally, refit the cartridge and the tap head. However, if you have quarter-turn or half-turn taps, you won't be able to replace the washer as these types of taps have ceramic discs instead.
If you're having trouble removing the tap cartridges, you may need to apply some gentle pressure or use a basin wrench to loosen them up. If the tap is still being stubborn, try using WD40 to see if that assists.
If you're unable to remove the cartridges, you might need to replace the whole basin top assembly. This option is more expensive but may save you maintenance hassles in the long term.
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Install the new tap
Now that you've removed the old tap, it's time to install the new one. First, ensure you have all the necessary components, including hoses, mounting hardware, and the mixer itself. These should have come with your purchase.
Next, you'll want to assemble the mixer by following the manufacturer's instructions. Attach any hoses or fittings as required, and apply Teflon tape to the threads of the hoses to ensure a watertight seal.
Then, insert the mixer tap through the hole in your vanity or basin, making sure it's properly aligned. Secure it in place using the provided mounting hardware and tighten the nuts from underneath the vanity top with an adjustable wrench.
If your new tap has flexible tap connectors, screw them onto the tap threads and tighten with an adjustable spanner. If there are no flexible tap connectors, you may need to cut the pipes and fit new ones. In this case, you'll also need to fit isolation valves for the new flexible tap connectors to connect to.
Finally, turn the water supply back on and test your new tap. Turn on both the hot and cold water functions to ensure everything is working correctly. A few adjustments might be needed if the water flow or temperature seems off.
To finish, apply plumber's putty or silicone sealant around the base of the mixer where it meets the basin to prevent water from seeping underneath. Smooth the sealant with a finger or cloth for a neat finish.
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Test the new tap
Once you have installed the new tap, it is important to test it to ensure it is functioning correctly. Here is a step-by-step guide to testing your new basin tap:
Turn on the Water Supply
First, turn on the water supply by opening the valves under the sink. If your setup does not have individual shut-off valves, you may need to turn on the main water supply to the house.
Check for Leaks
As the water starts flowing, carefully inspect the area around the tap for any signs of leaks. Pay close attention to the base of the tap and the connections. If you notice any leaks, tighten the fittings a little more. If that does not solve the issue, you may need to reapply Teflon tape to create a snug, leak-proof fit.
Test the Water Flow and Temperature
Now, turn on the tap and let the water flow. Test both the hot and cold water functions to ensure they are working correctly. Adjust the mixer until the water temperature and flow feel just right.
Apply Sealant (Optional)
For added protection against leaks, you can apply a bead of plumber's putty or silicone sealant around the base of the mixer where it meets the basin. Smooth the sealant with your finger or a cloth to achieve a neat finish.
Final Checks
With the tap tested and sealed, your new basin mixer is now ready for use! However, it is always a good idea to do a final check to ensure there are no leaks and that the water temperature and flow are functioning as expected.
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