Compact toilet repair kits, matched to the symptom
Most running toilets need the Fluidmaster 400CRP14, which replaces the 400A fill valve and the 501 flapper together. Korky 4010PK goes further, adding a flush valve, gasket and brass bolts for a full rebuild. On well water or weak pressure, choose the Fluidmaster 400H-002 PerforMAX.
Fluidmaster 400CRP14 suits the classic complaint, a tank that refills itself every few minutes. One box carries the fill valve and the flapper, which are the two parts that fail first. Missing from it are tank-to-bowl gaskets and bolts, so a floor leak needs the Korky 4010PK instead.
Diagnosis trips up most buyers, since a phantom flush, a constant hiss and a weak flush each trace to different hardware. Kit contents vary just as much, from a valve and flapper to a complete rebuild set. We compared included components, flush valve diameter, valve height range, refill noise and owner reports on how long the rubber survives chlorine tablets.
The shortlist, ranked
Fluidmaster 400CRP14 Toilet Fill Valve and Flapper Repair Kit
Two parts fail on most toilets, and this box holds both, the 400A anti-siphon fill valve and a 501 rubber flapper. Shank twists to set valve height anywhere from roughly 9 to 14 inches, covering short two-piece tanks and taller one-piece bowls. Refill runs faster than the brass ballcock it usually replaces.
Pros
- Covers the fill valve and flapper, the two usual culprits
- Height adjusts by hand, with no tools in the tank
- Replacement 400A parts sit in almost every hardware aisle
Cons
- No tank-to-bowl gasket or bolts in the box
- Will not seal on the 3 in flush valves used by newer bowls
Korky 4010PK Universal Complete Toilet Repair Kit
Gutting a tank calls for this set, which carries a flush valve alongside the 528 fill valve, flapper, gasket and brass tank bolts. Chlorazone rubber is compounded to survive bleach tablets and well-water chemicals. Swapping the flush valve means lifting the tank off the bowl, so budget an hour rather than fifteen minutes.
Pros
- Only kit here that replaces the flush valve itself
- Brass bolts avoid the rust that seizes steel hardware
- Chlorazone rubber suits households using bleach tablets
Cons
- Tank has to come off the bowl to install
- Overkill when only the flapper leaks
Fluidmaster 400AK Complete Toilet Tank Repair Kit
Adding a tank-to-bowl gasket and bolts to the familiar 400A valve and flapper lands this between the two kits above. A running tank and a drip at the mounting bolts both get fixed in one trip. Flush valve stays put, which keeps the job near half an hour.
Pros
- Handles bolt seepage as well as a running tank
- Existing flush valve stays, so the tank rarely needs lifting
- Runs the same 400A valve as the top pick
Cons
- Gasket fit is tight in some older two-piece tanks
- Plastic bolts wear faster than brass ones
Korky 2004BMP QuietFILL Platinum Complete Repair Kit
Noise decides this one, because the QuietFILL valve sends water down the shank instead of spraying it into open air. Bathrooms sharing a wall with a bedroom benefit most. An adjustable flapper comes in the box, letting you dial flush volume between a partial and a full tank.
Pros
- Refill is clearly quieter than a standard spray valve
- Flapper dial tunes the water used per flush
- Anti-siphon design meets common plumbing code
Cons
- Quieter flow means a slower refill
- No flush valve or tank bolts included
Fluidmaster 400H-002 PerforMAX Fill Valve and Flapper Kit
PerforMAX pushes more water per minute than the standard 400A, which counts on well systems and upper floors where pressure sags. Waiting time between flushes drops noticeably. Inside the valve sits a removable filter screen, worth having anywhere sediment clogs the inlet.
Pros
- Strong choice on well water or weak street pressure
- Filter screen rinses clean instead of being replaced
- Adjustable flapper sets the flush volume
Cons
- Louder in use than the Korky QuietFILL
- Taller minimum height rules out very short tanks
Danco HYR460 All-In-One Toilet Repair Kit
Water pooling on the floor behind a bowl usually traces to a hardened tank-to-bowl gasket or rusted bolts. This kit targets exactly that, bundling gasket, bolts, washers, flapper and a fill valve. Universal sizing covers most two-piece toilets built in recent decades.
Pros
- Fixes floor leaks that valve-only kits leave alone
- Full hardware set, so no second trip for washers
- Instructions are written for first-time DIY
Cons
- Fill valve feels less refined than Fluidmaster or Korky units
- Tank must be lifted off the bowl
Fluidmaster 550DFRK-3 Dual Flush Conversion Kit
Conversion turns a single-flush toilet into a two-button dual flush, short for liquids and full for solids. Out goes the flapper mechanism, in comes a push-button plate through the old handle hole. How much water it saves depends on which button the household presses.
Pros
- Cuts water on the majority of daily flushes
- Keeps the existing bowl and tank in place
- Button plate uses the existing trip lever hole
Cons
- No fill valve in the box
- Older tanks sometimes need the handle hole enlarged
How to choose
Match the kit to the symptom Start with the symptom, because each one points at a different part. Water trickling into the bowl between flushes means a worn flapper. A hiss that never stops, or water spilling into the overflow tube, blames the fill valve. Puddles behind the bowl come from the tank-to-bowl gasket or corroded bolts. Weak flushing with a full tank usually means the flapper drops too early.
Check your flush valve size before ordering Nearly every kit here assumes a 2 inch flush valve opening, the long-running standard. Newer high-efficiency bowls from Kohler, American Standard and Glacier Bay often use a 3 inch valve for a faster dump. Measure the opening at the bottom of the tank first, or the flapper will never seal. Korky and Fluidmaster both sell 3 inch flappers separately. Valve height matters as well. A 400A spans roughly 9 to 14 inches, while Korky valves start lower, near 7.75 inches.
Kits for bleach tablets, hard water and well water Chlorine kills tank rubber faster than anything else. Drop-in bleach tablets can wreck a standard flapper within months, which is why Korky uses Chlorazone rubber in the 4010PK and 2004BMP. Well water brings different trouble, mainly sand and iron that clog fill valve inlets. PerforMAX in the 400H-002 answers that with a filter screen you rinse rather than a valve you replace. Softened supply is gentler on rubber, so a basic kit lasts longer there.
Quiet refill and lower water use Refill noise carries through framing, which matters in a powder room next to a bedroom. Korky QuietFILL routes water down the shank instead of spraying, and owners report a clear drop in sound. Slower refill is the tradeoff, so skip it in a busy family bathroom. Where a smaller water bill is the goal, the 550DFRK-3 dual flush conversion saves more per year than any flapper swap. That saving only arrives if everyone actually uses the small button.
Side by side
| # | Model | Includes | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Fluidmaster 400CRP14 Toilet Fill Valve and Flapper Repair Kit | 400A fill valve, 501 flapper, refill tube, shank washer | Best overall | 9.4 | Check price |
| 2 | Korky 4010PK Universal Complete Toilet Repair Kit | Fill valve, flush valve, flapper, tank-to-bowl gasket, bolts | Best for a full tank rebuild | 9.2 | Check price |
| 3 | Fluidmaster 400AK Complete Toilet Tank Repair Kit | 400A fill valve, flapper, tank-to-bowl gasket, bolts | Best value | 9.0 | Check price |
| 4 | Korky 2004BMP QuietFILL Platinum Complete Repair Kit | QuietFILL Platinum valve, adjustable flapper, hardware | Best for quiet refill | 8.8 | Check price |
| 5 | Fluidmaster 400H-002 PerforMAX Fill Valve and Flapper Kit | PerforMAX fill valve, adjustable flapper | Best for low water pressure | 8.6 | Check price |
| 6 | Danco HYR460 All-In-One Toilet Repair Kit | Fill valve, flapper, tank-to-bowl gasket, bolts and washers | Best for tank-to-bowl leaks | 8.3 | Check price |
| 7 | Fluidmaster 550DFRK-3 Dual Flush Conversion Kit | Converts single flush to dual flush | Best for cutting water use | 8.0 | Check price |
Good to know
Why does my toilet keep running after it flushes?
A worn flapper causes it about nine times out of ten. Rubber hardens, warps or picks up mineral scale and stops sealing against the flush valve seat. Replacing the flapper and fill valve together, as the Fluidmaster 400CRP14 does, prevents a repeat six months later.
What does a complete toilet repair kit include?
Full kits such as the Korky 4010PK hold a fill valve, flush valve, flapper, tank-to-bowl gasket and bolts. Mid-range sets like the Fluidmaster 400AK skip the flush valve and keep the gasket. Basic boxes stop at a fill valve and a flapper.
Will a universal toilet repair kit fit any brand?
Universal parts cover most two-piece toilets with a 2 inch flush valve, including Kohler, American Standard and Toto. One-piece and pressure-assist models often need brand-specific components. Measure the flush valve diameter and tank depth before ordering.
How long does it take to replace a toilet fill valve?
Owners report fifteen to twenty minutes for a valve and flapper swap with the tank still bolted down. Add roughly forty minutes when the kit replaces the flush valve, since the tank must come off. Shut the supply off and sponge the tank dry first.
Which toilet repair kit is best for hard water?
Korky kits using Chlorazone rubber hold up best against chlorine tablets and mineral-heavy supply. Sediment-carrying well water suits the Fluidmaster 400H-002 PerforMAX better, thanks to its cleanable filter screen. Both outlast standard rubber in aggressive water.
Fluidmaster vs Korky: which kit should you buy?
Fluidmaster 400A is the most widely stocked valve, so a spare part is easy to find locally. Korky leans on chlorine-resistant rubber, quieter refill and complete kits that include the flush valve. Decide on box contents rather than brand loyalty.
Do I need a 2 inch or 3 inch flapper?
Look inside the empty tank and measure the opening the flapper covers. Toilets made before the mid 2000s almost always use 2 inches. Many high-efficiency bowls since then use 3 inches, and a 2 inch flapper will not seal on them.
Can a dual flush conversion kit really save water?
Saving happens only when the half flush gets used for liquid waste. A household pressing the full button every time sees no change at all. Fluidmaster 550DFRK-3 supplies the mechanism, while the habit does the actual work.
What tools do you need to install a toilet repair kit?
A valve and flapper swap needs channel-lock pliers, a sponge and a towel. Kits that replace the flush valve also call for an adjustable wrench and a hacksaw blade for corroded bolts. Keep a small bucket handy for the water left in the tank.
Is repairing an old toilet worth it, or should you replace it?
Repair makes sense when the porcelain is sound and the bowl still clears waste in one flush. Cracked porcelain, a weak flush with new parts, or a pre-1994 tank using far more water per flush all argue for replacement. Anything else is an hour of work with a kit.
The verdict
Buy the Fluidmaster 400CRP14 first when a tank will not stop refilling, since the fill valve and flapper together explain most failures. Rusted bolts, an aging tank or bleach-chewed rubber move the decision to the Korky 4010PK. Well-water homes should skip straight to the 400H-002 PerforMAX for its higher flow and rinseable filter screen.
