Last Easter a family in Gregory Hills came home from four days at the coast to water running out under the front door. A flexi hose under the ensuite basin had let go, probably on the first night, and had been running at full mains pressure for the best part of three days. Carpet, skirting boards, the kitchen ceiling below, the lot. The hose that failed was nine years old and had a ring of rust around the crimp that anyone would have spotted with a torch, if anyone had ever looked.
That is the whole problem with a flexi hose. It is cheap, it is hidden in a cupboard, and when it bursts it fails wide open, usually when nobody is home. Suncorp went through 22,000 water damage claims from 2024 and found roughly one in ten was a burst flexi hose, with the average claim running well into five figures. When their plumbers inspected homes, about 30 per cent of the hoses they checked needed replacing. Insurers now say a flexi hose is built to last five to ten years. If you want it found today, we are a leak detection plumber, no call-out fee, across South West Sydney.
A flexi hose is the braided connector under your basins, sink and toilet. The braid corrodes, kinks or fatigues, the rubber liner bursts, and the hose runs at full mains pressure until someone turns it off. Check every hose twice a year for rust, fraying, bulges and crust, replace anything over ten years old or of unknown age, and turn the water off at the meter when you go away.
What a flexi hose is and where yours are
A flexi hose (braided hose, flexible connector) is a rubber tube inside a woven stainless steel braid, with a nut at each end. It replaced rigid copper tails because it is quick to fit and forgiving of taps that do not line up. You will find them under every basin and kitchen sink with a mixer tap, behind the toilet cistern, on the dishwasher and washing machine, on some fridges, and on plenty of hot water systems and outdoor kitchens. An average house in Leppington has ten to fifteen of them, and most owners could not point to any.
Why a flexible hose bursts
The braid is what gives the hose its strength; the rubber liner on its own cannot hold mains pressure. So anything that damages the braid eventually bursts the hose:
- Corrosion. Bleach and chlorine fumes from cleaning products stored under the sink attack stainless braid, and so do damp cupboards. Once the braid rusts through, the liner bulges out of the gap and splits.
- Twisting and kinking. A hose fitted too short, bent hard at the nut, or twisted while the nut was tightened is under strain from day one.
- Over-tightening. Cranking the nut cracks the seal or distorts the crimp. Hand tight plus a quarter turn is the rule.
- High water pressure. Mains pressure in parts of Prestons and Edmondson Park runs well over the 500 kPa the plumbing standard allows inside a house. Every hose on that supply is being overworked, and a pressure limiting valve at the meter is the fix. My post on water pressure and pressure limiting valves covers it.
- Cheap hoses. Non-WaterMark hoses from an online marketplace are not legal to install in Australia and they fail early. Look for the WaterMark symbol on the tag.
- Age. Rubber hardens, braid fatigues. Ten years is the outside.
The five-minute flexi hose check
Do this twice a year. Suncorp suggests ten minutes every six months; five is enough once you know what you are looking for. Take a torch and go cupboard by cupboard.
- Look at the braid along its whole length, especially near the nuts. Brown or orange rust spots, or broken and frayed strands, mean replace it.
- Look for green or white crust at the crimp. That is water weeping through and drying, and the hose is already failing.
- Look for bulges. A hose that is fatter in one spot has lost its braid there.
- Check the shape. A tight curve, a twist, or a hose pulled straight and tight was fitted badly.
- Feel the cupboard floor and the nuts for damp. A weep at the nut is a warning, not a mystery.
- Find the date. Some hoses have a year on the tag. If not, and you do not know when it was fitted, treat it as old, and tag the date when it is replaced.
- Turn the isolation tap (the small mini stop tap the hose connects to) off and on. If it will not turn, or drips when you do, it needs fixing too, because it is how you stop the flood.
| What you see | What it means | What to do |
|---|---|---|
| Rust spots or frayed strands on the braid | Braid is failing, liner will bulge next | Replace now |
| Green or white crust at the nut | Slow weep drying on the fitting | Replace now, check the isolation valve |
| Bulge in the hose | Braid gone at that point | Turn off the isolation tap, replace today |
| Tight bend, twist or stretched hose | Poor installation, early failure likely | Replace and refit with the right length |
| Clean braid, no date, house over ten years old | Unknown age | Replace this year and tag the date |
| Isolation tap seized or dripping | No way to stop a burst quickly | Replace the valve with the hose |
Flexi hose replacement: when to do it
Any hose showing rust, fraying, bulging or crust: now. Any hose over ten years old, or of unknown age in a house more than ten years old: this year. Any hose in a house you have just bought: I would do the lot in one visit and reset the clock, because you have no idea how they were fitted. And whenever a tap, toilet or vanity is replaced, the hoses get replaced with it. Buy WaterMark certified hoses with stainless braid and a long manufacturer's warranty; the better ones carry ten years or more. Hoses with a built-in water stop are worth the extra under a basin nobody looks at.
If one does let go, the first two moves are in my post on what to do in the first ten minutes of a burst: turn off the isolation tap under the fixture, and if there is not one or it will not turn, shut the water off at the meter.
Burst flexi hose insurance: what you need to know
Most home and contents policies cover sudden and unexpected escape of liquid, and a burst hose usually qualifies. Where people come unstuck is maintenance. If the hose was visibly corroded for years, the isolation valve was seized, or the claim is for a slow leak that has been staining the cupboard for months, insurers can reduce or decline. I am not an insurance adviser, so read your own policy, but two habits protect you: check the hoses twice a year and note the date, and keep the invoice when a plumber replaces them.
The other habit is free. When you go away for more than a night or two, turn the water off at the meter. Every insurer says it, and a burst hose in an empty house is the worst case there is. If the meter keeps ticking with everything off, you already have a leak, and my post on hidden water leaks explains the meter test.
Can you replace a flexi hose under the sink yourself?
Connecting a washing machine or dishwasher hose to its tap is fine to do yourself; that is what the tap is for. The hoses hard-connected to the water supply under a basin, sink or cistern are plumbing work in NSW, which means a licensed plumber. There is a practical reason too: the thread has to match, the seal has to seat, the length has to be right, and the isolation valve is often the part that actually needs replacing. A single hose swap is a short job. There is no separate line for it in the Sydney price guides, so I quote on inspection; for a sense of scale, the Sydney 2026 price guides put a plumber's call-out at $69 to $170, hourly rates at $92 to $230 (most around $140), and a burst pipe repair at $230 to $920. Doing every hose in the house in one visit is the cheapest way per hose, and I check the isolation valves and tapware at the same time.
Why do flexi hoses burst?
The stainless braid corrodes, usually from cleaning chemicals stored under the sink, from chlorinated water sitting against it, or from being kinked or twisted at installation. Once a few strands go, the rubber liner inside has nothing holding it against mains pressure and it splits. High water pressure and age finish the job, which is why we fit a pressure limiting valve where the mains is strong and replace hoses as a set at ten years. If one has already gone, our burst pipe guide covers the first ten minutes.
When to call a plumber
Ring straight away if a hose has burst and you cannot stop the water, or if the isolation valve will not turn. That is a genuine emergency. Book a business-hours visit if the check above turned up rust, fraying or crust, if your hoses are over ten years old, if you have just bought a place, or if your pressure is high enough to spray the sink. None of those need a night call-out.
Done right. Done once. Monarch covers South West Sydney and the Macarthur region for leaks and burst pipes, hose audits and pressure limiting valves. If you need a plumber in Gregory Hills, Prestons or anywhere between, ring 0455 222 292 and I will give you a price before I start.
Related guides: hidden water leak detection.
Need it sorted? Ring 0455 222 292 any hour or book online. Monarch Civil & Plumbing is a leak detection plumber, no call-out fee, quoted on inspection, same rate day or night.
Emergency in Liverpool or Campbelltown right now?
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Frequently asked
How long does a flexi hose last?
Insurers put the working life at five to ten years, and that matches what I see. Some run twenty years in a dry cupboard with nothing stored near them; others rust through in five under a kitchen sink full of bleach. Age is only one factor. High mains pressure, a tight bend at the nut and cleaning product fumes all shorten it. If you do not know when a hose was fitted, treat it as old and replace it.
How do I know if a flexi hose is about to burst?
Look at the braid with a torch. Rust spots, broken or frayed strands, a bulge anywhere along the hose, or green and white crust at the crimp all mean the hose is failing. A damp cupboard floor or a weep at the nut is a warning too. Hoses do not always give notice, which is why the check is twice a year rather than when something looks wrong. Anything over ten years old gets replaced regardless.
Does home insurance cover a burst flexi hose?
Usually, if the burst was sudden and unexpected. Where claims get reduced or declined is maintenance: a hose that was visibly corroded for years, a seized isolation valve, or a slow leak that has been staining the cupboard for months. Read your own policy. Checking the hoses twice a year, noting the date, and keeping the plumber's invoice when they are replaced is the simplest way to show you looked after them.
Should I turn the water off when I go on holiday?
Yes. Turn it off at the meter for anything longer than a night or two. A burst hose in an empty house runs at full mains pressure until someone comes home, and a plumber quoted by Suncorp put it well: one hose left running for a day can release enough water to fill a backyard pool. Turning off the meter costs nothing. If the meter keeps moving with everything in the house off, you already have a leak.
Can I replace a flexi hose under the sink myself?
Connecting a washing machine or dishwasher hose to its tap is fine. The hoses hard connected to the water supply under a basin, sink or cistern are plumbing work in NSW, which means a licensed plumber. In practice the thread, the seal, the length and the isolation valve all have to be right, and the valve is often the part that actually needs replacing. Doing every hose in the house in one visit is the cheapest way to get it done.
Why do flexi hoses burst more in some Sydney suburbs?
Water pressure. Parts of South West Sydney get mains pressure well above the 500 kPa the plumbing standard allows inside a house, and every hose on that supply is working harder than it was designed to. A pressure limiting valve fitted at the meter brings the whole house back into range, protects the hoses, taps and hot water system, and usually cures banging pipes at the same time.
Licensed plumber and drainer based in Austral, 13+ years in the trade, working across Liverpool, Fairfield and the Macarthur region. About Paul