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The part that is actually running, not the whole tank · review

Korky 3060BP 3 in toilet flapper review

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

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What the maker puts in writing

  • Fits a large 3” flush valve opening
  • Flapper made of chlorine resistant rubber
  • Stainless steel chain attachment
  • From the description: “Ultra High Performance Flapper… Over fifty years ago, Lavelle Industries launched the first toilet flapper, the Original Korky”

Three bullets, and two of them matter

This is the shortest page on this shelf and it names the two things that break a flapper.

Chlorine

A flapper sits in tank water all day, every day, and that water is chlorinated — increasingly with chloramine, which is more aggressive still.

The rubber hardens. Then it curls at the edge. Then it stops sealing.

What follows is the failure nobody traces: a silent trickle from tank to bowl, around the clock, with the fill valve topping up every few minutes. The faint hiss everybody recognizes and nobody investigates, and a water bill that has quietly gone up.

Chlorine resistant rubber is the whole answer to that, and it is the single most important material claim in this category. Four of the ten listings on this shelf address chemical attack; Zurn goes further and names chloramine specifically.

And the chain

The other way a flapper fails.

A plated steel chain in chlorinated water rusts and eventually a link parts — usually at the top, at the lever arm. Then the flapper cannot be lifted, the toilet will not flush, and you open the tank to find a chain in two pieces.

Stainless steel chain attachment.

Korky is the only listing on this shelf that says what its chain is made of. Fluidmaster publishes an “adjustable length kink-free chain”, which addresses a different problem — a chain long enough to get trapped under the flapper and hold it open.

Three inches, and you must check

This fits a 3 in opening. Lift the tank lid and measure the hole the flapper covers.

Two inches was the standard for decades. Three came with high-efficiency toilets, where a wider opening dumps the tank faster and lets 1.28 gallons do the work 3.5 gallons used to.

A 3 in flapper will not seal a 2 in valve. The Fluidmaster 555CRP8 on this shelf is the 2 in kit — and it cannot be returned.

Against the Fluidmaster flapper beside it

Korky 3060BP — $11.98 — chlorine-resistant rubber, stainless chain. Fluidmaster 5403 — $16.89 — silicone seal stated to last 10x longer and resist chlorine and hard water, an adjustable dial for flush volume, kink-free chain, 10-year warranty.

Four dollars ninety-one buys the warranty and the dial.

If the water is hard as well as chlorinated, or if the new flapper may need tuning to flush properly, Fluidmaster’s page is the stronger one.

If not: Lavelle Industries made the first toilet flapper and has been making them for over fifty years, and this one names its rubber and its chain.

Availability

Available at around $11.98 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.

Strengths, and the catches

Strengths

  • Chlorine resistant rubber, which addresses the one thing that actually destroys toilet flappers
  • A stainless steel chain attachment, where a plated chain is what rusts through and drops the flapper
  • Twelve dollars, and a flapper is the five-minute repair that fixes most running toilets

Compromises

  • No warranty published, where Fluidmaster’s 3 in flapper on this shelf carries ten years for $4.91 more
  • No flush volume adjustment, where the Fluidmaster has a dial
  • Three bullets: no GPF range, no installation note and no hard water claim

Specifications

Valve typeA 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.
Tank opening diameter3 in.
Adjustable height rangeNOT PUBLISHED, and no dial or flush-volume adjustment is claimed anywhere.
Inlet connectionNONE — a flapper sits on the outlet. Installation is not described on this listing, and a flapper needs no tank removal.
Inlet positionNOT APPLICABLE.
Stated flush volumesNOT PUBLISHED — no GPF range at all. Chlorine resistance is claimed; HARD WATER RESISTANCE IS NOT. 3.2 oz (91 g), 2.64 × 5 × 7.52 in (67 × 127 × 191 mm), and no warranty is published.
Amazon referenceB0034LX2BG
EAN0049057103500

The questions we get

Why does chlorine resistance matter so much?

Because it is the only thing that kills a flapper. A toilet flapper sits in tank water twenty-four hours a day, and municipal water is chlorinated — increasingly with chloramine, which is more aggressive still. The rubber slowly hardens, then curls at the edge, and then it no longer seals. What follows is a silent leak: water trickling from tank to bowl around the clock, refilling every few minutes, costing money and making the quiet hissing noise everyone recognizes and nobody traces. Korky names chlorine-resistant rubber; Fluidmaster answers with a silicone seal resisting chlorine and hard water. Four of the ten listings on this shelf address chemical attack in some form, and it is the single most important material question in the category.

Why is a stainless chain worth noticing?

Because the other common flapper failure is the chain. A plated steel chain in chlorinated water rusts, then a link parts — usually at the top, where it attaches to the lever arm — and the flapper is left unliftable. The toilet stops flushing entirely and you open the tank to find a chain in two pieces. Stainless does not do that. Korky is the only listing on this shelf that names the chain material; Fluidmaster publishes an "adjustable length kink-free chain", which addresses a different failure — a chain long enough to get caught under the flapper and hold it open.

Korky or the Fluidmaster 5403?

Both are 3 in flappers and they publish different strengths. Korky: chlorine-resistant rubber and a stainless chain, $11.98. Fluidmaster: a silicone seal stated to last ten times longer and resist chlorine and hard water, an adjustable dial controlling flush volume, a kink-free chain, and a 10-year warranty — for $16.89. Four dollars ninety-one buys the warranty and the dial. If your water is hard as well as chlorinated, or if the replacement flapper might need tuning, Fluidmaster has the better page. If not, Korky invented these and has been making them for fifty years.

Against the closest bathroom fittings on price

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 typeTank opening diameterAdjustable height rangeInlet connection
Korky 3060BP 3 in toilet flapper $12 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.NOT PUBLISHED, and no dial or flush-volume adjustment is claimed anywhere.NONE — a flapper sits on the outlet. Installation is not described on this listing, and a flapper needs no tank removal.
Fluidmaster 555C PerforMAX flush valve kit $12 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.NOT APPLICABLE — a flapper has no height to set. What adjusts here is the flush volume, on the dial.NONE — a flapper sits on the outlet, not the inlet. Installation is peel and stick, with no glue, no tools stated and no tank removal.
Mansfield 210 flush valve $16 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.NOT PUBLISHED by the maker.NOT PUBLISHED, and the installation is not described on this listing either.
Fluidmaster 5403 3 in toilet flapper $17 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.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 — the kit sits on the outlet. Installation is drop-in, no tools, under 20 minutes, with no tank removal.

Where the models diverge, in bathroom fittings

  • If price decides: this model, at $12.

The price on Amazon.com

This model is listed on Amazon.com, at ≈ $12 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.

Who buys this one, among bathroom fittings

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

Cited in our bathroom fittings guides

What buyers actually choose

Amazon reports what buyers took in the month before this page was last checked: at least 6,000.

The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.

Sources

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.

How we assess these bathroom fittings

Also on your shortlist, probably

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