Domakihub How to Fix a Leaking Flexi Hose — And When to Call a Plumber
Stop a dripping or burst flexible connector before it floods your kitchen, bathroom, or holiday rental.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Flexi hoses — the short, braided stainless-steel connectors that link your tap or toilet cistern to the water supply — are the most common source of under-sink floods in Greek homes, holiday villas, and hotel bathrooms. The video above walks through a complete replacement; this guide adds the diagnostic steps, the right parts to buy locally, and a clear line between what you can safely do yourself and when a licensed plumber must take over. Catching a weeping connector early, before the braiding splits under pressure, can save thousands of euros in water damage to a tiled floor or the apartment below.
Why Flexi Hoses Fail
Flexi hoses are rated for a service life of roughly five to ten years, yet many stay in place far longer — especially in rental properties that change hands without a full inspection. The inner rubber tube degrades from constant water pressure and chlorine, while the outer stainless braid corrodes in humid under-sink conditions or where cleaning chemicals splash regularly. The result is a pinhole weep, a joint drip at one of the two end fittings, or — in the worst case — a sudden full-bore burst that can discharge hundreds of litres in an hour.
Look for the early signs: a faint mineral-deposit ring on the cabinet floor, condensation that seems heavier than usual, or a soft hissing sound when the house is quiet. In Greece, summer heat waves accelerate rubber degradation in holiday properties that sit closed for months at pressure, so a pre-season check is worthwhile.
Tools and Parts You Need
You will need an adjustable spanner (or two, for counter-holding), a small bucket, a few dry cloths, and PTFE tape. The replacement hose itself is sold by length (20 cm, 30 cm, 40 cm, 50 cm are the common sizes) and by end fitting — the most frequent combination in Greek plumbing is a 3/8" compression nut on the valve end and a 1/2" or 3/8" female thread on the tap tail. Measure the old hose end-to-end before you go to the hardware shop, and photograph both fittings so you buy the correct thread pattern.
Choose a hose carrying the EN 13618 or ISO 9001 quality mark — cheap unmarked hoses are the ones most likely to fail. Expect to pay between €4 and €15 per hose at a Greek plumbers' merchant (υδραυλικά). If the isolation valve under the sink has never been closed in years and feels stiff or leaks when you try to turn it, stop and call a plumber — a failed valve under pressure is no longer a DIY job.
How to Replace a Leaking Flexi Hose (Step by Step)
- 1
Shut off the water supply
Turn the isolation valve on the pipe directly below the hose — usually a slotted-head quarter-turn valve — so the slot runs across the pipe (closed). If there is no isolation valve, turn off the mains stopcock for that riser or the whole flat. Open the tap above to release pressure and drain the line, then put a small bucket or thick cloth under the connection before you loosen anything.
- 2
Confirm where the leak is coming from
Dry everything with a cloth, then watch under good light or a torch while the water is still off. Drips at the end nuts (compression joints) sometimes only need the nut tightened a quarter-turn — try this first before replacing the hose. If the leak is in the body of the braiding, or if the rubber inside is visibly bulging, the hose must be replaced; tightening or taping it is not safe.
- 3
Remove the old hose
Hold the valve body steady with one spanner and use a second to loosen the compression nut at the bottom of the hose — always counter-hold so you do not twist the valve off the pipe. At the tap-tail end (top), unscrew the nut by hand once loosened. Ease the hose out, catching residual water in the bucket. Inspect both the valve seat and the tap tail for corrosion, debris, or damaged threads; clean them with a cloth before fitting the new hose.
- 4
Fit the replacement hose
Wrap two or three clockwise turns of PTFE tape around any male threads that will receive a female threaded end (usually the tap tail). Hand-tighten both nuts first, making sure neither cross-threads. Then snug each nut with a spanner — firm but not overtightened; one-quarter to one-half turn past hand-tight is enough for a compression fitting. Do not kink or stretch the hose; it should sit in a gentle curve with no sharp bends.
- 5
Restore the water and check for leaks
Open the isolation valve slowly and let pressure build, then check both end connections under torchlight. Run the tap for thirty seconds and check again. A dry, mineral-free joint is a good joint. If you see a drip, turn the valve off and snug that nut by another eighth of a turn before re-checking. Leave the cabinet door open for an hour and check once more before closing up.
Rather have a pro handle it?
Get a vetted plumbing pro in your city — one number, booked in EN/EL/DE.
FAQ
- Can I repair a burst flexi hose with tape or sealant?
- No. A hose that has split under pressure cannot be safely repaired with tape, silicone, or hose clamps. The inner rubber is already compromised and any patch will fail again, potentially without warning. Replace the entire hose — they cost only a few euros and the job takes under fifteen minutes once the water is off.
- How often should flexi hoses be replaced as a precaution?
- Most manufacturers and plumbers recommend replacing flexi hoses every five to ten years regardless of visible condition. For holiday rentals or hotels where a leak might go unnoticed for days, a proactive five-year replacement cycle (or installing a leak-detection sensor under every sink) is good practice and significantly reduces insurance risk.
- When does a leaking flexi hose need a licensed plumber rather than DIY?
- Call a plumber if: the isolation valve itself is leaking or will not close; the pipe at the wall or under the vanity shows corrosion or movement; the leak is behind a tiled panel or inside a wall cavity; the water supply to the whole property must be shut off but you cannot locate the stopcock; or the fitting threads are stripped or corroded. In a shared apartment block in Greece, any doubt is reason enough to call a professional — the liability for flood damage to neighbours is real.