3-Inch Toto Toilet Flapper Replacement - 2 Pack
Two red 3-inch Toto toilet flapper replacements with metal chains.
Two red 3-inch Toto toilet flapper replacements with stainless steel chains shown from side and top angles.
Infographic showing dimensions and compatibility for a 3-inch Toto toilet flapper replacement.
3-inch red rubber Toto toilet flapper replacement with stainless steel chain and material feature callouts.
Red 3-inch Toto toilet flapper replacement with metal chain and compatibility information graphic.
Person installing a 3-inch Toto toilet flapper replacement to fix running water and leaks.
Comparison graphic showing BlueStars 3-inch Toto toilet flapper replacement versus standard flappers.
Red 3-inch Toto toilet flapper replacement with metal chain on a BlueStars promotional background.
Two red 3-inch Toto toilet flapper replacements with metal chains.
Two red 3-inch Toto toilet flapper replacements with stainless steel chains shown from side and top angles.
Infographic showing dimensions and compatibility for a 3-inch Toto toilet flapper replacement.
3-inch red rubber Toto toilet flapper replacement with stainless steel chain and material feature callouts.
Red 3-inch Toto toilet flapper replacement with metal chain and compatibility information graphic.
Person installing a 3-inch Toto toilet flapper replacement to fix running water and leaks.
Comparison graphic showing BlueStars 3-inch Toto toilet flapper replacement versus standard flappers.
Red 3-inch Toto toilet flapper replacement with metal chain on a BlueStars promotional background.
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3-Inch Toto Toilet Flapper Replacement - 2 Pack

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3-Inch Toto Toilet Flapper Replacement

Key Features

  • Engineered specifically for 3-inch flush valves to ensure a high-volume, leak-proof seal.
  • Constructed from specialized chloramine-resistant rubber to prevent warping and degradation in harsh water conditions.
  • Integrated adjustable float allows for precise water volume control per flush, optimizing water usage.
  • Heavy-duty stainless steel chain and hardware designed to resist corrosion and prevent kinking during operation.
  • Reinforced hinge points provide a consistent pivot motion for reliable closure after every flush cycle.

Replaces / Cross-Reference Part Numbers

  • Toto: THU138S, THU140S, THU175S, THU253S, THU275S, THU277S, THU299S, THU331S, THU332S, THU347S, THU369S, THU499S, THU500S
  • Korky: 2023BP / 2023BM
  • Jones Stephens: C04009

Compatibility & Fitment

  • Toto G-Max Flush Systems
  • Toto Power Gravity Models
  • Standard 3-inch flush valves for Toto models: Drake, Eco Drake, Ultramax, and Supreme
  • It is NOT compatible with the following Toto Power Gravity Toilet Models: CST43SD, CST744SD, CST44SLD, CST743SDB, CST744SDB, CST744SLDB.

When to Replace

  • Ghost Flushing: The toilet tank refills periodically when not in use.
  • Running Water: A constant sound of water trickling into the bowl after the tank has filled.
  • Slow Leak: Water level in the tank drops below the overflow pipe over time.
  • Material Degradation: The flapper feels slimy to the touch or leaves a black residue on fingers, indicating the rubber is breaking down.
  • Improper Seal: The flapper appears warped or no longer sits flush against the valve seat.

Installation Tips

  • Shut off the water supply valve behind the toilet and flush to empty the tank.
  • Remove the old flapper by unhooking the ears from the overflow pipe pegs and disconnecting the chain from the trip lever.
  • Clean the flush valve seat with a soft cloth to remove mineral deposits or debris that could prevent a proper seal.
  • Attach the new flapper ears to the pegs and adjust the chain length; there should be approximately 1/4 inch of slack when the lever is at rest.
  • Turn the water back on and perform a test flush to ensure the flapper lifts fully and seals tightly without catching on the chain.
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FAQ

This flapper is designed specifically for Toto toilets that utilize a 3-inch flush valve. It is compatible with most Toto G-Max and E-Max flushing systems. If your current flapper has a 3-inch diameter opening and a chain-style lift mechanism, this unit will be a direct fit.
The most common sign is a toilet that 'ghost flushes,' where the tank refills periodically on its own without the handle being touched. You may also notice the water level in the tank dropping slowly, a weak or incomplete flush, or a constant hissing sound coming from the tank, indicating that water is leaking past the flapper seal.
No tools are required for this installation. It is a simple DIY task that typically takes less than five minutes. You simply turn off the water supply, flush the toilet to drain the tank, unhook the old flapper chain from the trip lever, slide the flapper ears off the flush valve pins, and reverse the process to install the new one.
Flappers are made of flexible rubber or silicone, which naturally degrades over time due to exposure to water minerals, chlorine, and other chemical treatments used in municipal water supplies. Over years of use, the material can become brittle, warped, or develop a buildup of calcium deposits, preventing it from creating a watertight seal against the flush valve.
Yes, proper chain tension is critical. After installation, ensure there is about 1/2 inch of slack in the chain when the flapper is closed. If the chain is too tight, the flapper will not seat properly, causing a leak. If it is too loose, the flapper may not lift high enough to allow for a full, powerful flush.