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Gerber G0099788 3″ Flapper for HET Tanks

Bright blue soft rubber flapper with beaded chain and metal clip.
Bright blue soft rubber flapper with beaded chain and metal clip.
Bright blue soft rubber flapper with beaded chain and metal clip.

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“Fast, friendly, knowledgeable, hard to find items not carried by most big box stores. ”
-William S.
02/23/2026

$14.27

 

The Gerber G0099788 & 99-788 is a genuine 3-inch soft toilet flapper designed for high-efficiency toilets (HET).

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, asknoel@noelsplumbingsupply.com, or via the text widget on this screen.

SKU: 97889 Category: Tag:

The Gerber G0099778 3-Inch Toilet Tank Flapper is a genuine blue rubber replacement part designed to stop toilet leaks, restore flush power, and save water. It is a prime example of a straightforward, tool-free DIY plumbing project that any homeowner can complete.

 

G0099778    99-778

 

  • 3-inch diameter (measures approximately 3 and 5/8 inches across the top)
  • Soft rubber/plastic construction; lacks the extra underside hole found on the Gerber 99-770 model
  • Fits select 1.28 GPF (gallons per flush) high-efficiency models
  • Gerber Viper tanks and toilets (such as Gtb20528, Gtb20552, Gtb20562, Gws28590, Gvp28590)
  • Gerber Maxwell tanks (such as G0028970 and G0028980)

 

Common questions about this product

Is this item the original manufacturer's recommended replacement part? chevron-icon

Yes, this is the OEM recommended part.

Is this the correct item for my application? chevron-icon

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

 

We will make sure you have the right part.

 

 

chat iconWHAT OUR CUSTOMERS SAY…

“Fast, friendly, knowledgeable, hard to find items not carried by most big box stores. ”
-William S.
02/23/2026
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