Sep 16, 2025
In daily life, a leaking toilet is a common problem. Since the flapper is one of the parts that ages most easily, many people first choose to replace it. However, sometimes even with a new flapper, the toilet still leaks. If this happens, it usually means the problem is not only with the flapper itself. This article explains the most common causes and solutions to help you fix the issue thoroughly.
1. Confirm the Flapper Is Installed Correctly
Even if you have a new flapper, there can still be issues:
Check the size: Different toilets require different flapper diameters, most commonly 2 inch toilet flapper replacement or 3 inch toilet flapper replacement. If the size does not match, for example using a 2-inch flapper on a 3-inch flush valve, the seal cannot be completely tight, leading to toilet flapper leaking after replacement.
Ensure the position is aligned: The flapper must fall directly into the center of the flush valve seat, otherwise water may leak from the edges.
Check chain tension: If the chain is too tight, the flapper cannot fully close; if it is too loose, flushing becomes ineffective. The best method is to let the flapper close first, then measure and adjust the chain length.
2. Inspect the Flush Valve Condition
Cracks or damage: Even with a new flapper, if the flush valve or overflow tube has cracks, water will still leak into the bowl. In such cases, the entire flush valve needs replacement.
Loose flush valve base: Shake the flush valve gently to see if it is firmly installed. If loose, water can leak between the flush valve base and the tank. Tighten it and check again to ensure no further leakage.
Scale buildup on the valve seat: In areas with hard water, mineral deposits can build up around the flush valve seat, preventing the flapper from sealing properly. Clean the seat regularly with a brush or scrub pad.
If these issues exist, you may find your replaced flapper toilet still leaking or a leaking toilet flapper replaced still leaking situation.
3. Check the Fill Valve Water Level
If the fill valve is set too high, the water level in the tank may rise above the overflow tube. This allows water to continuously flow into the toilet bowl, and the fill valve will keep running because it never reaches the shut-off point. This often looks like the toilet still running after replacing flapper.
Solution: Adjust the float on the fill valve so the water level stays about 15 mm (about half an inch) below the top of the overflow tube. Be careful not to set the level too low, as insufficient water will cause weak flushing.
Conclusion
If your toilet flapper is leaking after replacement, check in order: the flapper itself, the flush valve, and the fill valve. By carefully inspecting each component and addressing the problem step by step, most cases of toilet still leaking after replacing flapper can be solved quickly and effectively.
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