Plumbing
3-Inch Toilet Flapper Replacement Kit for Gerber 99-788 Flush Valves
Reviews
4.7/ 5
- 5 stars 7
- 4 stars 1
- 3 stars 1
- 2 stars 0
- 1 star 0
- Brand
- iFealClear
Product description
This kit is designed specifically for 3-inch Gerber 99-788 flush valves and is not a universal flapper. The package includes a 3" rubber flapper stopper and a rust-proof stainless steel chain finished with clip hooks for attachment.
The stopper is molded from chlorine-resistant rubber to withstand hard water and reduce corrosion compared with ordinary compounds. The chain is stainless steel to prevent breakage or rusting where metal contacts tank mechanisms.
Dimension details: the flapper fits a 3-inch opening; the chain length is 10 inches; the distance between the two attachment arms measures approximately 2.83 inches and each arm is about 1 inch wide. The replacement uses expandable holes on the attachment arms so it can slip over older flapper bars in many vintage toilets.
Installation requires no tools—simply clear away any debris from the valve seat, snap the flapper into place over the arm, attach the chain to the flush lever at an appropriate length, and test the flush. This repair stops silent tank leaks and phantom flushing that can waste up to around 200 gallons per day when left unchecked.
Before fitting, measure the opening and the attachment arm spacing on your tank to confirm compatibility. This model is incompatible with Kohler and Mansfield systems, so double-check the middle opening size and arm fittings prior to installation.
Pros
- Chlorine-resistant rubber for hard-water durability
- Rust-proof stainless steel chain and clip hooks
- Tool-free, quick installation
Cons
- Made for Gerber 99-788 only — not universal
- Rubber may deform after extended service
- Requires accurate 3" measurement before purchase
VerdictA durable, chlorine-resistant replacement that reliably stops running toilets on compatible Gerber 99-788 valves. Installation is simple and tool-free, and the stainless chain resists corrosion. Check measurements before ordering — it won’t fit Kohler or Mansfield systems — and some users report the rubber can soften or change shape after extended use. Overall a cost-effective DIY fix for compatib
Reviews
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tdawg 5/5
Quick to fit
Perfect replacement; slipped into place and functions as expected.
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Jessica Davis 3/5
Lasted nearly two years
Worked great for almost two years (bought Oct 2024, Aug 2026 now). Eventually the rubber curled and started leaking.
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UsefulUsable 5/5
Surprisingly reliable
Was unsure of the brand, but it performed well and feels like a solid value compared with other options.
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fama 5/5
Installation was easy
Installed quickly and has worked perfectly since.
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ShopsAlot 5/5
Fits perfectly
Very easy to install and matched my flapper seat exactly.
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Chrissy 5/5
Did the job — simple install
Bought the wrong universal kit first but this flapper solved the issue. The flexible rubber attachments stretched over my 20+ year toilet and stopped the leak, so my water use dropped.
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Sal 5/5
Ideal for vintage toilets
My old integrated flapper had to be cut out; this replacement expands over the flapper bar and sealed the leak right away. Cheap, easy fix without calling a plumber.
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USMC_LADY 4/5
Stops running toilet
Matched my Gerber valve and ended the running. Worked exactly as needed and worth it.
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Daniela 5/5
Snug, leak-free fit
Couldn't find the right size locally, but this matched my tank and eliminated the leak completely.
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