How to find the right Toilet Replacement Parts AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Toilet Replacement Parts
- Flush valve size
- Measure the drain opening at the bottom of the tank. Common sizes are 2, 3, and 4 inches. A flapper or seal of the wrong size will leak and cause a running toilet.
- Flush mechanism type
- Find out whether your toilet uses a flapper or a canister or tower valve. Many Kohler and TOTO toilets need brand-specific seals rather than generic flappers.
- Fill valve
- Universal adjustable-height fill valves fit most tanks. Check the tank's height range. The fill valve is the part that wears out most often and causes slow filling or hissing.
- Model number
- Read the model number stamped inside the tank before ordering parts that are not universal. Low-flow and pressure-assist toilets often need parts made for that specific model.
- Wax ring or waxless seal
- Use an extra-thick or stacked-height seal if the flange sits below the finished floor. A seal that is too thin will leak at the base.
Brands that matter
- Fluidmaster: Widely used universal fill valves and flappers.
- Korky: Flappers and fill valves, including models made for specific toilets.
- Danco: Broad range of common repair parts.
- Oatey: Wax rings and toilet flange hardware.
- Kohler: Genuine canister seals and model-specific parts.
- TOTO: Genuine flappers and fill valves for TOTO models.
What to avoid
- Generic flappers on toilets with canister valves
- Chlorine tablets in the tank, which degrade rubber seals
- Universal kits for pressure-assist toilets
Questions
Why does my toilet keep running after I replaced the flapper?
The flapper may be the wrong size or the chain may be too tight. Also check whether the fill valve is overfilling the tank into the overflow tube.