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The part that is actually running, not the whole tank

The best toilet flush and fill valves for 2026

A toilet that runs is almost never a toilet that needs replacing; it is a cheap seal on one of two parts. The fill valve lets water into the tank and stops at a level; when it fails, water spills into the overflow tube. The flush valve and its flapper hold water back until you press the handle; when the flapper hardens, water trickles into the bowl continuously. Telling them apart takes a few drops of food coloring in the tank. Buying the replacement then comes down to fit: the flush valve opening, 2 inches on older toilets and 3 inches on most made in the last twenty years, model-specific valves from Kohler and Mansfield, and commercial flushometer parts from Sloan and Zurn, which are not tank parts at all. We compare size, seal material, adjustability, compatibility exclusions and warranty.

By

The models we recommend

  1. Fluidmaster 555C PerforMAX flush valve kit

    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

    Check price on Amazon Read the review: Fluidmaster 555C PerforMAX flush valve kit

  2. Danco HydroRight dual flush converter

    HydroRight water-saving dual flush valve with push-button handle in plastic and chrome, converting most standard toilets into a dual-flush toilet using up to 70% less water for liquids and paper, and replacing a worn flapper, chain and handle in one part; fitting 1.6 to 3.5+ gallon per flush standard 2-piece toilets with a 2 in flush valve and requiring a 10 inch minimum clearance from the highest point of the flush valve opening to the inside of the tank lid, and stated not to fit Mansfield toilets; drop-in installation without tools in under 20 minutes with no tank removal; a chemical-resistant Perma fit silicone seal stated not to warp; the maker states a family of four saves more than 15,000 gallons a year and that the reduced flush is the setting needed four times out of five

    A dual-flush conversion valve with a two-button handle, fitting 2 in valve two-piece toilets without tools.

    Best for: An older 1.6 to 3.5 GPF toilet with a 2 in valve, where halving the water is worth twenty minutes

    ≈ $26

    Check price on Amazon Read the review: Danco HydroRight dual flush converter

  5. Geberit Type 380 fill valve for tank 240.700

    Fill valve · Geberit Type 380 · for surface tank no. 240.700 · side entry 3/8 in · fill height set by turning the spindle · noise group I, DIN 4109

    The manufacturer's own valve for one specific Geberit tank — which is either exactly right for you or completely wrong, and the listing says which.

    Best for: A Geberit surface tank number 240.700, where a genuine part is worth paying for.

    ≈ $35

    Check price on Amazon Read the review: Geberit Type 380 fill valve for tank 240.700

  6. Kohler 1083980 canister flush valve kit

    Genuine Kohler 3 in toilet canister flush valve kit featuring a 3 in canister with a 3 in outlet, compatible with the Kohler Cimarron tank model number K-4634 and explicitly stated not to be a universal part; the maker advises looking inside the back wall of the toilet tank to identify the tank model number, and states the valve was designed by Kohler engineers to maintain original product performance

    A genuine Kohler 3 in canister flush valve kit for the Cimarron tank model K-4634.

    Best for: A Kohler Cimarron with tank K-4634 — and only that

    ≈ $21

    Check price on Amazon Read the review: Kohler 1083980 canister flush valve kit

  7. Korky 3060BP 3 in toilet flapper

    Large premium toilet flapper fitting a 3 in flush valve opening, made of chlorine resistant rubber with a stainless steel chain attachment; described by the maker as an ultra high performance flapper

    A 3 in toilet flapper in chlorine resistant rubber with a stainless steel chain attachment.

    Best for: A three-inch valve with a tired flapper, where chlorine-resistant rubber and five minutes are the whole job

    ≈ $12

    Check price on Amazon Read the review: Korky 3060BP 3 in toilet flapper

  9. Sloan Regal R-1003-A rebuild kit

    Regal water closet diaphragm rebuild kit for 3.5 GPF manual flushometers, built with proprietary natural rubber and a brass bypass, intended to replace worn or end-of-service-life assemblies; the kit includes the A-38-A diaphragm, a handle repair kit, the V-551-A vacuum breaker kit and a tailpiece O-ring; designed specifically as a replacement for the Sloan Regal 3.5 GPF flushometer line (clamshell number 33170011), and listed under two part numbers, 3317003 and 33170011, which the maker states are the same item

    A complete diaphragm rebuild kit for Sloan Regal 3.5 GPF manual water closet flushometers.

    Best for: A facilities cabinet: rebuilding a Sloan Regal 3.5 GPF flushometer rather than replacing it

    ≈ $29

    Check price on Amazon Read the review: Sloan Regal R-1003-A rebuild kit

  10. Zurn Aquaflush exposed flush valve

    Aquaflush exposed manual diaphragm flush valve for a 3/4 in urinal with a 1.0 gallon per flush volume, a standard 11-1/2 in rough-in and 3/4 in top spud, supplied with an exposed sweat solder kit and a polished chrome-plated cast wall flange; a clog-resistant triple filter diaphragm with a quiet GO BLUE dual-seal diaphragm and clog-resistant bypass, chemical and chloramine-resistant gaskets and seals for extended service life and lower maintenance, and a manual ADA compliant handle with no-leak seal technology; a 3-year limited warranty

    A manual exposed diaphragm urinal flushometer at 1.0 GPF with chloramine-resistant seals.

    Best for: A commercial washroom retrofit — a 1.0 GPF urinal valve that will not need attention for years

    ≈ $119

    Check price on Amazon Read the review: Zurn Aquaflush exposed flush valve

For which need, in toilet flush valves and fill valves

Going through the tank opening

Tank opening diameter decides what fits. It is the first measurement to take.

Sloan R-1003-A Regal

Connecting to the supply

The published inlet connection decides the thread that receives the flexible hose.

Danco HYR270 HydroRight

For whom, within toilet flush valves and fill valves

Side or bottom water entry
The published inlet position must match what exists on the tank.
A frugal flush
Stated flush volumes are manufacturer figures. This site reports them without measuring them.
Repair rather than replacement
The published valve type describes the mechanism used. It decides which spare parts exist.

What each advantage costs, on toilet flush valves and fill valves

Universal mechanism against adjustment
The published adjustable height range covers several tanks, at the cost of a setting to make.
Dual flush against simplicity
Stated flush volumes describe what the mechanism offers. Two volumes imply two controls.
Inlet position against choice
The published position sharply narrows the list of mechanisms compatible with a given tank.

Before buying toilet flush valves and fill valves

How do I know the mechanism will fit?

The published tank opening diameter must match that of the tank.

What does valve type say?

The principle used to close the flush, published by the manufacturer.

Is the mechanism height-adjustable?

The published adjustable height range gives the travel available.

Where does the water connect?

The published inlet position says so: side or bottom depending on the model.

What inlet connection?

The published connection gives the thread. It must match the existing hose.

What are stated flush volumes worth?

They are manufacturer figures. This site reports them without taking any measurement.

Is the fill valve included?

That depends on the reference. This site publishes what the manufacturer states.

Does the tank have to be emptied?

This site publishes mechanism specifications and describes no intervention.

What to remember about toilet flush valves and fill valves

The opening diameter decides what fits, the inlet position decides what connects, and the adjustable height range decides what adapts without changing the tank.

A quick look at toilet flush valves and fill valves

  • Most affordable here: Fluidmaster 555CRP8 Universal PerforMAX, at $12.
  • Adjustable height range: 3 to 10, on 3 of the 10 models.

Toilet flush valves and fill valves in one table

The table keeps only the dimensions given by four products in five. Below that threshold, a column measures missing data rather than the product.

ModelPriceInlet positionValve typeTank opening diameter
Fluidmaster 555CRP8 Universal PerforMAX$12NOT APPLICABLE.A PerforMAX adjustable water-saving FLAPPER, with a dial that sets the flush volume — not a complete valve. It fits most 2 in flush valve toilets, from 1.28 GPF high-efficiency to 3.5 GPF, and NOT 3 in valves. Not dual flush.2 in.
Korky 3060BP$12NOT APPLICABLE.A FLAPPER ONLY — not a valve and not a kit — in chlorine-resistant rubber on a stainless steel chain. It fits a 3 in opening and NOT a 2 in one. Three published bullets, one of which is that Lavelle Industries launched the first toilet flapper over fifty years ago.3 in.
Mansfield M210$16NOT PUBLISHED.A flush valve with an instant shut-off, stated not to rust or corrode. THAT IS THE WHOLE OF WHAT THE MAKER PUBLISHES: four bullets, one of which is the words « Flush valve » and another the carton size. Neither the material nor the seal material nor the chlorine resistance is published.NOT PUBLISHED by the maker, and neither are the compatible models — so nothing on this listing tells you whether it fits your tank.
Fluidmaster 5403$17NOT APPLICABLE.A drop-in kit replacing the FLAPPER, THE CHAIN AND THE HANDLE together, on a Perma fit silicone seal stated chemical resistant, stated not to warp and stated to last ten times longer than a regular flapper. 3 in, and the maker states it will NOT fit 2 in valves, nor Mansfield toilets.3 in.
Kohler 1083980$21NOT APPLICABLE.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.
Danco HYR270 HydroRight$26NOT APPLICABLE.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.
Fluidmaster 830V-001-P4$29NOT APPLICABLE.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.
Sloan R-1003-A Regal$29NOT APPLICABLE.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.
Geberit 240700001$35Side entry, for surface-mounted tanks — statedGeberit fill valve Type 380 — statedNot stated as a figure — the valve is specified for Geberit surface tank no. 240.700
Zurn Z6003-WS1-YB-YC Aquaflush$119Top spud, 3/4 in.A MANUAL URINAL FLUSH VALVE — commercial, 3/4 in, and NOT a tank toilet valve. The handle is ADA compliant with no-leak seal technology, and there is NO SENSOR: this is the manual version. The diaphragm is a clog-resistant triple filter, GO BLUE dual-seal with a clog-resistant bypass, and the seals are stated chemical AND CHLORAMINE resistant — the only chloramine claim on this shelf.NOT APPLICABLE — a urinal valve has no tank. The rough-in is the standard 11-1/2 in, on a 3/4 in top spud.

What each budget reaches here

Lower range

$12 – $16

3 models

Fluidmaster 555CRP8 Universal PerforMAX, Korky 3060BP, Mansfield M210

Mid range

$17 – $26

3 models

Fluidmaster 5403, Kohler 1083980, Danco HYR270 HydroRight

Upper range

$29 – $119

4 models

Fluidmaster 830V-001-P4, Sloan R-1003-A Regal, Geberit 240700001

Also worth reading on toilet flush valves and fill valves

What we read, and how we rank

Specifications: manufacturer sheets for bathroom fittings and the matching Amazon product pages. Prices and availability: Keepa. Every figure in this table names its source.

Most recent revision in this category: October 29, 2026.

How we assess toilet flush valves and fill valves

Prices quoted in these summaries are dated readings. The live price is shown next to each product.