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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.

chat iconWHAT OUR CUSTOMERS SAY…

“The vacuum breaker on my outdoor spigot failed and Noel's Plumbing was the only placeI could find that had the appropriate mfr. part. I sent a text with photos on Wednesday evening to make sure the part I found was correct. In less than 2 hours later, I had a reply confirming it was the correct part. Placed my order that evening and received the part on Saturday afternoon (about 2.75 days) and my plumbing issue was resolved! I highly recommend - I really appreciated the prompt and pleasant response. ”
-Kimberly S.
04/25/2026

$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…

“Just want to say THANK YOU for your help with this! I couldn't believe the handle arrived Thursday (after ordering Wednesday). I brought it up to my dad's house Friday and just looking at it I didn't think it was going to fit....but it fit perfectly. So appreciative for your expertise and quick shipping! ”
-Ashley K.
02/04/2023
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