Domakihub How to Replace a Toilet Flapper — and Stop That Running Toilet
A five-minute fix that saves water and money in any home, rental, or hotel room.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 4 min read
A constantly running toilet is one of the most common and costly plumbing problems in Greek homes, holiday rentals, and hotel rooms — and in most cases a worn-out flapper is the culprit. The video above walks through the repair visually; this article gives you the exact steps, what to buy, and what to watch out for in older cisterns common across Greece. The whole job takes about five minutes and costs under €5 in parts.
What Is a Toilet Flapper and Why Does It Fail?
The flapper is a rubber seal that sits at the bottom of the cistern (water tank) and controls when water flows into the bowl. Every time you flush, the flapper lifts to release water, then drops back down to seal the tank so it can refill. Over time — usually two to five years — the rubber warps, hardens, or cracks, and the seal is no longer watertight.
When the flapper fails, water trickles continuously from the cistern into the bowl. You may hear a faint hiss or notice the tank refilling on its own every few minutes. In Greece, where water bills are charged by the cubic metre and summer tourism puts heavy demand on plumbing, a leaking flapper can waste hundreds of litres per day and add significantly to utility costs.
Choosing the Right Replacement Flapper
Most toilets in Greece use either a standard 2-inch flapper or — in older, taller cisterns common in Greek island properties — a 3-inch flapper. The safest approach is to take the old flapper to the hardware shop (ferramenteria) and match it by size and the type of pegs or ears that hook onto the overflow tube.
Universal flappers from brands like Fluidmaster are widely available at plumbing suppliers and large DIY stores (Praktiker, Leroy Merlin) and fit the vast majority of cisterns. Avoid cheap no-brand rubber parts; they tend to degrade faster in the warm Greek climate.
How to Replace a Toilet Flapper: Step by Step
- 1
Shut off the water supply
Turn the shut-off valve on the pipe behind or below the toilet clockwise until it stops. If there is no isolation valve, turn off the mains at the building stopcock. Then flush the toilet once to empty the cistern — this is essential before you touch anything inside the tank.
- 2
Remove the cistern lid and unhook the old flapper
Lift the cistern lid carefully and set it aside on a flat surface (they break easily on tile floors). Reach inside and unhook the two side ears of the flapper from the pegs on the overflow tube. Then disconnect the chain or lift arm from the flush handle lever. The old flapper should now come out in one piece.
- 3
Inspect the flush valve seat
Before fitting the new part, run your finger around the round plastic or brass seat where the flapper rests. If you feel mineral deposits, corrosion, or a rough ridge, clean it gently with a cloth and a little white vinegar. A damaged seat will cause even a new flapper to leak; if the seat is cracked, you will need a more extensive repair or a full flush-valve replacement.
- 4
Fit the new flapper and adjust the chain
Hook the ears of the new flapper onto the pegs of the overflow tube — they should click on firmly and sit flat and level. Attach the chain to the flush lever, leaving roughly 1–2 cm of slack. Too little slack and the flapper will not seal fully after flushing; too much slack and the chain can slip under the flapper and prevent it from closing.
- 5
Restore the water supply and test
Turn the shut-off valve back on slowly and let the cistern fill completely. Flush once and watch the flapper drop and seal cleanly. Then wait two minutes and listen for any hissing or trickling. If the tank stays quiet and stops refilling on its own, the repair is successful. Replace the lid and you are done.
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FAQ
- How do I know if the flapper is really the problem and not the fill valve?
- Do the food-colouring test: drop a few drops of food colouring into the cistern without flushing. Wait 10–15 minutes. If colour appears in the bowl, the flapper is leaking. If the cistern itself overflows into the overflow tube (water level too high), the issue is the fill valve, not the flapper.
- Can I replace a toilet flapper without turning off the water mains?
- Yes — most toilets have an isolation valve directly on the supply pipe behind the cistern. Closing that valve is sufficient. You only need the building mains if there is no isolation valve, which is common in older Greek properties where individual isolation valves were not always installed.
- How long should a new toilet flapper last?
- A quality rubber flapper typically lasts three to five years under normal use. In holiday rentals or hotel rooms with high turnover, replacement every two to three years is sensible. Hard or heavily chlorinated water can accelerate wear, so silicone flappers (slightly more expensive) are worth considering in areas with aggressive water chemistry.