The part that is actually running, not the whole tank · review
A dual-flush conversion valve with a two-button handle, fitting 2 in valve two-piece toilets without tools.
Everything else on this shelf restores a toilet to how it was. This one converts it.
Two buttons: a reduced flush for liquids and paper, a full flush for solids. And the premise, stated in the description, is the honest one: the reduced setting is what you need four times out of five.
That is why a dual-flush conversion saves far more on an old 3.5 gallon toilet than fitting a water-saving flapper to it. The flapper trims each flush a little. This removes most of the water from four flushes in five.
Four people flushing five times a day is about 7,300 flushes a year.
If four in five become reduced flushes, saving roughly two gallons each, that is about 11,700 gallons — and on a 3.5 GPF toilet, where the saving per flush is larger, 15,000 is reachable.
The arithmetic holds up, which is more than can be said for most percentage claims on a plumbing shelf.
Replaces a worn-out toilet flapper, chain and handle.
Those are the three commonest faults in a tank. The flapper hardens and leaks. The chain rusts and parts. The handle’s plastic arm snaps.
One part, all three, without tools and without taking the tank off — which is the step that makes people call a plumber.
Ten inches.
Requires 10-inch minimum clearance from highest point of the flush valve opening to the inside of the tank lid.
The mechanism is tall: a two-button actuator stands where a flapper and a chain used to lie flat.
Danco is the only maker on this shelf that publishes a clearance figure. Measure it before ordering — lid off, tape from the top of the valve opening to where the underside of the lid sits. Low-profile and compact modern tanks frequently do not have ten inches.
Will NOT FIT Mansfield toilets and is not compatible.
Mansfield does not use the standard flapper arrangement this part replaces.
And two listings away on this same shelf sits the Mansfield M210 flush valve, for exactly those owners. It is the clearest illustration of what this shelf is: the right part depends entirely on what is already bolted to your floor.
A 2 in valve, in a 2-piece toilet.
Not a 3 in valve — four of the ten products here are 3 in, which has become the default on high-efficiency toilets. Not a one-piece toilet, where the Fluidmaster 830V on this shelf carries the same exclusion.
Perma fit silicone, chemical resistant, will not warp — which is the right material, because chlorine and chloramine are what harden a seal until it leaks.
No warranty published, though. Fluidmaster publishes ten years on a flapper and five on two other parts here for less money.
Available at around $26.49 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.
| Valve type | A DUAL FLUSH CONVERSION: it replaces the flapper, the chain and the handle together with two buttons, on a Perma fit silicone seal stated chemical resistant and stated not to warp, in durable plastic with a chrome handle. It will NOT FIT MANSFIELD TOILETS. The maker claims up to 70% less water on the reduced flush, more than 15,000 gallons a year for a family of four, and states that the reduced flush is the one needed four times out of five. |
|---|---|
| Tank opening diameter | 2 in — where the Fluidmaster dual flush on this shelf is 3 in, which is the one figure that decides between them. |
| Adjustable height range | NOT PUBLISHED. What the listing gives instead is a CLEARANCE: 10 in minimum from the top of the flush valve opening to the inside of the tank lid. |
| Inlet connection | NONE — it sits on the outlet. Installation is drop-in, no tools, under 20 minutes, with no tank removal. |
| Inlet position | NOT APPLICABLE. |
| Stated flush volumes | For standard 2-piece toilets of 1.6 to 3.5+ GPF. 4.02 × 2.99 × 10.5 in (102 × 76 × 267 mm), and NEITHER A WEIGHT NOR A WARRANTY is published. |
| Amazon reference | B00D8GC5K6 |
| EAN | 188670000459 |
It is the thing that sends this part back, and Danco is the only maker on this shelf to publish a clearance figure at all. The mechanism is tall: a two-button actuator sits on top of the valve where a flapper and chain used to sit flat. The listing is specific — "requires 10-inch minimum clearance from highest point of the flush valve opening to the inside of the tank lid". Measure it before ordering: tank lid off, tape from the top of the valve opening to where the underside of the lid will be. Low-profile tanks and some modern compact toilets do not have ten inches.
It is the right order of magnitude. Four people flushing five times a day is about 7,300 flushes a year. If four in five of those become reduced flushes and each saves roughly two gallons, that is about 11,700 gallons — and on an older 3.5 GPF toilet, where the saving per flush is larger, 15,000 is reachable. The figure that makes the arithmetic work is the one in the description: "the setting needed 4 out of 5 times". That is the honest premise of dual flush, and it is why a dual-flush conversion on an old high-volume toilet saves far more than fitting a water-saving flapper to it.
Because Mansfield toilets do not use the standard flapper arrangement this part replaces. Most American toilets have a rubber flapper hinged over a 2 or 3 inch opening; Mansfield uses a different valve design. Danco states the exclusion plainly in its compatibility bullet — "Will NOT FIT Mansfield toilets and is not compatible" — and, usefully, the Mansfield M210 valve is on this same shelf for exactly those owners. It is the clearest example of why this is a parts shelf rather than a product shelf: the right answer depends entirely on what is already in your bathroom.
Same category, nearby prices, between bathroom fittings. What remains is the specifications every one publishes — half empty, a column is no use.
| Model | Price | Valve type | Tank opening diameter | Adjustable height range | Inlet connection |
|---|---|---|---|---|---|
| Danco HydroRight dual flush converter | $26 | A DUAL FLUSH CONVERSION: it replaces the flapper, the chain and the handle together with two buttons, on a Perma fit silicone seal stated chemical resistant and stated not to warp, in durable plastic with a chrome handle. It will NOT FIT MANSFIELD TOILETS. The maker claims up to 70% less water on the reduced flush, more than 15,000 gallons a year for a family of four, and states that the reduced flush is the one needed four times out of five. | 2 in — where the Fluidmaster dual flush on this shelf is 3 in, which is the one figure that decides between them. | NOT PUBLISHED. What the listing gives instead is a CLEARANCE: 10 in minimum from the top of the flush valve opening to the inside of the tank lid. | NONE — it sits on the outlet. Installation is drop-in, no tools, under 20 minutes, with no tank removal. |
| Fluidmaster 830V 3 in dual flush valve | $29 | A DUAL FLUSH valve, sold as an exact replacement, 3 in, with full and half flush adjustable to match the factory settings. Named for Glacier Bay, AquaSource, Project Source and other dual flush toilets, and 2-PIECE ONLY — the maker states it is not compatible with 1-piece toilets. | 3 in. | NOT PUBLISHED, and NO CLEARANCE FIGURE either, where the 3 in Fluidmaster kit on this shelf gives 10 in. | NONE — it replaces the outlet valve. Installation is stated as easy, and whether the tank must come off is NOT STATED either way. |
| Sloan Regal R-1003-A rebuild kit | $29 | A REPAIR KIT FOR A FLUSHOMETER, not a tank valve at all: an A-38-A diaphragm, a handle repair kit, a V-551-A vacuum breaker kit and a tailpiece O-ring, for Sloan Regal 3.5 GPF manual water closet flushometers. COMMERCIAL, and NOT for a domestic tank toilet. | NOT APPLICABLE — a flushometer has no tank. The compatibility reference is clamshell number 33170011, and the maker states that 3317003 and 33170011 are the same item. | NOT APPLICABLE. | NOT PUBLISHED as a thread. The kit replaces worn or end-of-service-life assemblies, and no tools are stated. |
| Kohler 1083980 canister flush valve kit | $21 | A 3 in CANISTER flush valve kit — the only canister on this shelf — described as a valve replacement and repair kit whose items are NOT Itemized. A genuine Kohler part designed by Kohler engineers, which the maker states protects the warranty on Kohler products. The seal material and the chlorine resistance are not published, and neither is any adjustability. Cleaning is a soft dampened sponge or cloth, never an abrasive brush or a scouring pad. | 3 in, on a 3 in outlet, for the Kohler Cimarron tank model K-4634 — and the maker states it is NOT A UNIVERSAL PART. To identify your tank, it says to look inside the back wall for the model number. | NOT PUBLISHED by the maker. | NONE — a canister valve sits on the outlet. The installation is not described on this listing. |
This model is listed on Amazon.com, at ≈ $26 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on October 29, 2026.
An older 1.6 to 3.5 GPF toilet with a 2 in valve, where halving the water is worth twenty minutes
Specifications: the manufacturer sheet for bathroom fittings and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
3 in dual flush valve · exact replacement for 3 in two-piece dual flush toilets · Glacier Bay, AquaSource, Project Source
A 3 in dual flush valve replacement for Glacier Bay, AquaSource and Project Source two-piece toilets.
Best for: A Glacier Bay or AquaSource dual-flush two-piece toilet that has stopped flushing properly
≈ $29
Universal PerforMAX 2 in toilet flush valve repair kit with a peel-and-stick design eliminating glue and requiring no tank removal, including the PerforMAX adjustable water-saving flapper whose dial controls flush volume; a 2 in flush valve replacement kit suitable from 1.28 gallon high-efficiency designs to older 3.5 gallon per flush toilets, built from corrosion-resistant materials with a 5 year warranty per the maker description; the listing states a limit of one per order and that returns will not be honoured on this closeout item
A universal 2 in flush valve repair kit with a peel-and-stick seal and an adjustable PerforMAX flapper.
Best for: A leaking two-inch flush valve, measured first — the cheapest complete repair on this shelf
≈ $12
Universal 3 in flapper · solid frame, kink-free chain · adjustable · against ghost flushing
A universal 3 in adjustable toilet flapper with a silicone seal and a ten-year warranty.
Best for: A high-efficiency 3 in toilet that needs a flapper tuned to flush properly, with cover for a decade
≈ $17
