What the maker puts in writing
- “Restore original factory performance to your Glacier Bay or other Dual Flush Toilets”
- Easy to install
- “Fit’s 3” Dual Flush Valve, 2-Piece toilets, including Glacier Bay, AquaSource, Project Source and more”
- “Adjust the full or half flush to match factory settings, save water, and restore flush performance”
- “Superior flushing of solids and liquids; 5 year warranty, Note: Not compatable for 1-piece toilets”
- From the description: “designed to be an exact replacement dual flush valve for your 3” Dual Flush Valve 2-Piece Toilet… Built to last from high quality materials this model features a 5-year warranty”
Glacier Bay, AquaSource, Project Source
Three names, and they are the reason this listing exists.
Those are the house brands of the large American home improvement chains — and they are precisely the toilets whose parts nobody can find. A Kohler has a model number, a parts diagram and a dealer network. An own-brand toilet has a sticker on the tank and a store that stopped carrying that model four years ago.
Fluidmaster naming them in its compatibility bullet answers the question those owners actually have, which is not “is this a good valve” but “will this fit the toilet I inherited”.
It is the mirror of the Kohler listing on this shelf, which fits one named model and says so in capitals. Both are honest about fit, from opposite ends.
Restoring the flush, not just stopping the leak
Adjust the full or half flush to match factory settings.
This is the distinction worth understanding about dual-flush toilets.
A dual flush valve meters two volumes. As its seals age it does neither properly: the reduced flush becomes too small to clear the pan — so you press the full one every time, which defeats the point — and the full flush starts leaking away between uses.
Fitting a generic flapper to a dual-flush toilet cannot fix that. A flapper does one volume.
Both volumes adjustable means that after fitting you can set the half flush back to the amount the toilet was engineered around, rather than accepting whatever the new part gives you.
Five years
Which, on this shelf, is notable mainly because almost nobody publishes anything.
Fluidmaster: ten years on its flapper, five on this, five on its PerforMAX kit. Zurn: three years. Korky, Mansfield, Kohler, Danco, Sloan: none published.
Fluidmaster is the only maker on this shelf that warrants everything it sells here.
Two-piece, said twice
In the fifth bullet and again in the description: Not compatable for 1-piece toilets.
Look at the back of the toilet. A two-piece has a separate tank bolted onto the bowl with a visible joint. A one-piece is molded as a single unit, seamless.
The valve has to pass through the bottom of the tank and seal against it, and a one-piece has different internal geometry.
The Danco converter on this shelf carries the same exclusion. Two of the ten products here rule out one-piece toilets, and neither suggests what a one-piece owner should buy instead.
And three inches
Lift the lid and measure the opening. Four of the ten products on this shelf are 3 in and one is 2 in; the other five are a converter, a fill valve, the Mansfield-only valve and two commercial flushometer parts.
What is not here
No seal material, and no chlorine or chloramine resistance claim — where Fluidmaster’s own 5403 flapper on this shelf publishes a silicone seal that resists chlorine and hard water and is stated to last ten times longer.
On a dual flush valve, whose seals are the whole mechanism, that is the omission to notice.
No clearance figure either. The Danco converter here publishes the ten inches it needs under the tank lid, and a tall dual-flush mechanism raises the same question.
Availability
Available at around $29.48 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.
