Toto spares, Toto parts, Toto spare parts, Spare code no : TH418-2 - Rubber flapper,
A rubber flapper in a toilet tank is the seal that sits over the flush valve opening. When you flush, the flapper lifts up and lets water rush from the tank into the bowl. After the flush, it drops back and seals the opening so the tank can refill without water leaking out. WELCOME TO BHARAT ENTERPRISES
🔹 Material: Usually rubber or flexible elastomer that creates a watertight seal.
🔹 Function:
- Seals water in the tank when not flushing.
- Opens on flush to allow water flow.
- Prevents leaks that can cause continuous running or tank drainage. WELCOME TO BHARAT ENTERPRISES
When the rubber flapper wears out, hardened or cracked rubber means it won’t seal properly, leading to issues like a running toilet, incomplete flush, or constant water loss. This is a very common maintenance item on both Toto and other brand toilets.
📌 Typical Uses of a Toto Flapper
- Replaces worn/aged flappers in Toto flush valve tanks.
- Stops leakage from tank to bowl, improving flush performance and saving water.
- Restores correct flush valve function when the original seal fails. WELCOME TO BHARAT ENTERPRISES
- Often paired with the flush lever or push button mechanism inside the tank.
🧰 Installation & Troubleshooting Tips
✔ Make sure the tank side where the flapper seals is clean — scale or debris can prevent a good seal.
✔ The chain connecting the flapper to the flush lever shouldn’t be too loose or too tight — too much slack can keep it from sealing.
✔ If water continues to leak after flapper replacement, it could also be the flush valve seat or another gasket that needs replacing.
📍 About TOTO Part Numbering
Toto flappers often have part numbers like THU138S, THU175S, THU331S, etc., for specific flush valve sizes (often 2″ or 3″). A common universal replacement is THU500S, which fits many TOTO 3″ flush valve tanks. totousaparts.com
Since TH418-2 isn’t showing up in major parts lists or retail catalogs, it could be:
- A regional/obsolete Toto part number that has been superseded (similar to how THU112-2 became THU303).
- A factory internal code, not commonly sold retail.
- A variant specific to a certain Toto tank model or market.
If you have the exact toilet model printed inside your tank (e.g., CSTxxx or MSxxx), I can help match the correct current flapper part number to your model.
📦 Related Part (Sealing Gasket)
Here’s a related Toto sealing part commonly used in flush valve assemblies that may be helpful depending on your setup:
TOTO Flapper Seal Gasket 9BU001ER – a rubber/foam seal used in some Toto flush valve assemblies to ensure a tight water-seal beneath the flapper.
TOTO : Control unit, toto Powercable, toto Rubber flapper, toto Signal Cable& Conduit Pipe, toto Right hook,
toto Screw, toto Concealed Automatic Urinal Flush Valve, toto Shower Hanger & Screw, toto check nut & lock on cartridge, toto Controller Unit, toto Cartridge, toto Fill Valve, toto HANDLE/KNOB, toto SSBolts &Nuts, toto PRESSURE CONTR.., toto Avante Wall Hung Toilet W/Invisible Fixing Kit, toto Flexible Hose, INDIA.
TOTO : Base Plate Assy, toto Soft Landing Unit, toto Soft Landing Unit, toto Damper dryer for WL .., toto DUMPER / PLASTIC LID ON WAND, toto Indication Substrate Assembly, toto Fixed Shower Head, toto Bath & Spout, toto Handle,
Toto thermostatic knob, toto Flange Cap, toto Flange Plate, toto Clamp for valve connector, toto FRAME, toto sensorunit, toto Towel Ring, toto IN WALL SENSOR URINAL FLUSH VALVE, toto Ceramic cartridge for Faucets DUBAI.
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