What the maker puts in writing
- Universal design, fast and easy to install; peel and stick design eliminates messy glue, with no tank removal
- PerforMAX adjustable water-saving flapper included; replaces inefficient toilet flush valve designs and fixes worn, leaky flappers
- Durable build with corrosion resistant materials
- “2” flush valve replacement kit, from 1.28 HET to 3.5 gallon per flush designs”
- “Limit one (1) per order.” “Returns will not be honored on this closeout item”
- From the description: “the replacement can be installed in minutes… A universal design that fit’s most 2” flush valve toilet models… features a 5 year warrant”
Eight dollars seventy-eight for the whole thing
That is the striking number on this shelf, because of what it buys.
A flapper alone is $11.98 from Korky and $16.89 from Fluidmaster on this same shelf. This is the valve seat and the flapper together, for less than either.
The reason is in the listing: it is a closeout.
Which brings the condition attached
Limit one (1) per order.
Returns will not be honored on this closeout item.
So the price is final and the purchase is final.
For somebody who has taken the tank lid off, measured the opening and knows they need two inches, this is the best value on the shelf and nothing comes close.
For somebody guessing, it is the single item here where guessing wrong cannot be put right.
Measure the opening first
Lift the tank lid. The hole in the bottom of the tank that the flapper sits over is the flush valve opening. Measure across it.
Two inches was standard for decades and is what most older toilets have.
Three inches came in with high-efficiency toilets, because a wider opening dumps the tank faster — which is how a 1.28 gallon flush does the job a 3.5 gallon flush used to.
Five of the ten products on this shelf state a tank-valve size. Four of those five are three inches. The three-inch valve has become the default, which makes measuring more important rather than less.
Peel and stick, which is the real saving
A conventional flush valve replacement means draining the tank, unbolting it from the bowl, lifting it off, fitting a new spud washer and re-seating the whole thing.
That is the commonest reason somebody pays a plumber to fix a running toilet.
This seals a new valve seat over the old one from inside the tank, with an adhesive ring, with the tank left where it is. Eliminating messy glue in a no toilet tank removal install process.
The old valve stays. The new seat goes on top.
And the adjustable flapper that comes with it
The PerforMAX flapper has a dial that changes how long it stays open — which is how much water each flush uses.
That matters because a replacement flapper is often the wrong strength for the toilet: too little water and it needs two flushes, too much and you have undone the toilet’s efficiency. A dial lets you set it.
What it does not claim
Chlorine resistance. Fluidmaster’s own 5403 flapper on this shelf publishes a silicone seal that “resists chlorine and hard water” and “lasts 10X longer”; Korky publishes chlorine-resistant rubber.
This says only corrosion resistant materials — and chlorine in municipal water is what kills flappers.
The description does publish a 5 year warranty, which with Fluidmaster’s other two products here makes it the only maker on this shelf to warrant everything it sells.
Availability
Available at around $11.99 on Amazon.com when we checked on October 29, 2026, for delivery to a US address.
Stock and prices on Amazon.com move without notice; the button above opens the live listing.
Prices quoted in this text were read on October 29, 2026. The live price is at the top of the page.
