How to Get Rid of Airlock in a Mixer Tap
Step-by-step guide to clear airlock in a mixer tap with safe DIY methods, essential tools, and maintenance tips to prevent future airlock issues.
To remove an airlock in a mixer tap, shut off the water supply, relieve pressure, and carefully loosen the faucet aerator or cartridge to let trapped air escape. Reassemble, then run warm water to purge remaining air. If flow remains weak, check the supply hoses and seals for signs of damage.
Understanding airlocks in mixer taps
An airlock is trapped air within the water lines that disrupts smooth flow from a mixer tap. When air pockets form, water may sputter, deliver weak pressure, or arrive with inconsistent temperature. In many homes, airlocks occur after maintenance, long periods with valves shut, or a sudden change in water pressure. If you're wondering how to get rid of airlock in mixer tap, the usual fix is to bleed air at the faucet, reseating seals, and re-pressurizing the line. Knowing where the air sits helps you locate the best bleed point and avoid unnecessary disassembly. The goal is to replace the air with steady water flow, not to disassemble every component.
What causes airlocks in kitchen mixer taps
Airlocks form when air gets trapped in pipes or in the valve assemblies that feed your mixer tap. Causes include draining the system during maintenance, long periods with valves closed, or rapid changes in water pressure. Some taps use detachable aerators or cartridge assemblies that are particularly prone to trapping air if threads are damaged or if seals are dry. Recognizing these causes helps you identify where to bleed air, which reduces the risk of forcing components and creating leaks.
Safety considerations before you begin
Before starting any purge, switch off both hot and cold supply valves. Open the taps to relieve pressure and drain the line, then place towels or a tray beneath to protect cabinets from spills. Do not force fittings; if threads refuse to turn, stop and recheck alignment or wear. If the fixture is under warranty or shows signs of corrosion, consult the manufacturer’s guidelines to avoid voiding warranties and risking damage.
How to plan your purge (workflow and scope)
Create a quick plan to minimize mess. Identify whether you need to remove just the aerator or the entire cartridge, decide which tap (hot, cold, or both) to purge first, and set aside a clean workspace. Gather the tools you’ll need, plan for a 30–60 minute window, and prepare a towel for drips. Clear the area under the sink to avoid knocking items loose while you work.
What to do if a simple purge doesn't fix the problem
If air continues to disrupt flow after the purge, re-check the upstream supply hoses for kinks or leaks and inspect seals for wear. A stubborn airlock may indicate a degraded cartridge or o-ring that requires replacement. In some cases, flushing the line from the valve to the faucet bundle can remove deeper pockets of air. If uncertainty remains, consider consulting a plumber to avoid causing damage.
Maintenance to prevent future airlocks
Regularly inspect and replace worn washers and o-rings in faucet assemblies. Keep supply lines free from kinks and ensure the valves close completely when not in use. When performing renovations or replacing hoses, bleed the system before fully repressurizing to minimize air entry. A quick, periodic purge (once every few months) helps maintain steady flow and prolongs faucet life.
Tools & Materials
- Adjustable wrench(to loosen fittings under the faucet)
- Screwdriver (flat-head or Phillips)(for aerator or cartridge screws)
- Towel or tray(to catch drips and protect cabinet)
- Replacement washers/O-rings (optional)(only if wear is suspected)
- Silicone lubricant (optional)(for o-rings if dry)
Steps
Estimated time: 30-60 minutes
- 1
Shut off the water
Close both the hot and cold valves under the sink. Place a towel to catch drips. Confirm the taps do not leak while you work to prevent pressure buildup.
Tip: Double-check valves are fully closed before touching components. - 2
Relieve pressure and gain access
Open the taps briefly to relieve any remaining pressure. This also helps air escape when you loosen the aerator or cartridge.
Tip: Have a bucket handy for any residual water. - 3
Remove the aerator or cartridge
Use the appropriate tool to unscrew the aerator or cartridge. Do not force; if threads resist, re-check alignment or apply minimal heat to loosen.
Tip: Take a photo of the assembly before removing to aid reassembly. - 4
Purge air from the line
With both taps open, run warm water to flush out air until a steady flow returns. Watch for sputtering as air leaves the line.
Tip: If air remains, inspect upstream hoses for kinks or leaks. - 5
Re-seat and reassemble
Reinstall the aerator or cartridge, ensuring seals are seated. Use thread sealant sparingly if required by the manufacturer and re-tighten by hand first.
Tip: Hand-tighten and then give a quarter-turn with a wrench if needed. - 6
Test and monitor
Turn on the water and run both hot and cold taps. Confirm a steady, sputter-free flow and check for leaks after several cycles.
Tip: If leaks reappear, disassemble and re-check seals and threads.
Your Questions Answered
What is an airlock in a mixer tap?
An airlock is trapped air in the piping that blocks water flow. It often causes sputtering and reduced pressure, which a proper purge and reseating of components can usually fix.
An airlock is trapped air in the pipe that blocks flow; you purge it by opening taps and reseating parts.
Can an airlock cause temperature fluctuations?
Yes. Airlocks can disrupt the mixing of hot and cold water, leading to unstable temperatures until the air is purged.
Airlocks can cause temperature swings until cleared.
Is DIY airlock removal safe for beginners?
If you shut off the water and use the proper tools, most airlock purges are safe for DIYers. If uncertain, consult a professional.
Yes, with the water off and proper steps, DIY is generally safe, but consult a plumber if unsure.
What should I do if the airlock returns after purging?
Check upstream lines for air pockets or leaks, inspect seals, and consider replacing worn cartridges or o-rings.
If it keeps coming back, there may be a worn part or trapped air upstream.
When should I call a professional?
Call a professional if leaks persist after reassembly or if you notice corrosion or damaged hoses.
If leaks persist or you’re unsure, it’s wise to get a pro.
Watch Video
Top Takeaways
- Identify airlock symptoms early and act promptly
- Shut off water and purge air safely before disassembly
- Re-seat components and test thoroughly after reassembly
- Inspect hoses for leaks if the problem recurs
- Regular maintenance prevents future airlocks
