Toilets
Almost nothing that goes wrong with a toilet is the china. A tank that runs, a flush that no longer clears the bowl and a seat that slides are three separate parts, each a short repair. The order below is the order of diagnosis, and every part was sold on Amazon.com on October 29, 2026.
Five parts, in the order a toilet usually needs them. Prices are Amazon.com, read on October 29, 2026.
A slow leak from tank to bowl is the commonest toilet fault, and the cheapest. Measure the valve opening, then buy the flapper for it. On a 3-inch valve, the Fluidmaster 5403 has a silicone seal stated to resist chlorine and hard water, a dial to set the flush volume and a ten-year warranty, at about $17.
If a new flapper still leaks, the seat it closes on is pitted. The Fluidmaster PerforMAX 555C puts a new seat and flapper on a 2-inch valve without removing the tank, at about $12.
On a standard two-piece toilet, the Danco HydroRight converts the flush to dual flush with a push-button handle, at about $26. It states it does not fit Mansfield toilets or one-piece toilets; read that before ordering.
A seat that shifts every time someone sits is a hardware problem. The Kohler Brevia has Grip-Tight bumpers, Quick-Attach hardware and quick-release hinges, and fits compact elongated bowls as well as standard ones, at about $31. Measure from the bolts to the front of the bowl first: Kohler does not accept opened seats back.
The LUXE Bidet NEO 120 attaches under your existing seat with no electricity, with nozzles that retract behind a guard gate, at about $40. It is cold water only, like every bidet on this site.
A new toilet. The china is the part that does not wear out, and every fault above lives in something bolted to it.
The commonest fault, usually a worn flush valve seal, and it wastes a surprising amount of water.
Usually the tank water level rather than the pan, and adjustable in most mechanisms.
Often a scaled or partly closed shutoff valve rather than a fault in the toilet.
Where the location tells you whether it is a simple seal or a job for someone else.
| The symptom | The likely part | The difficulty |
|---|---|---|
| Runs constantly | Flush valve seal | Straightforward |
| Weak flush | Water level | Adjustment only |
| Slow refill | Fill valve or shutoff valve | Straightforward |
| Leaks at the base | Bowl connector or worse | Call someone |
Tank parts are rubber and plastic sitting permanently in water, and in hard water they scale as well as perish. They fail gradually and quietly, which is why a toilet can waste water for months before anyone notices anything at all.
Water and old fittings.
Prices quoted in this text were read on October 29, 2026. The live price is at the top of the page.
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
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
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
Elongated and compact elongated, 18 × 14.18 in · plastic · Quiet-Close · Grip-Tight bumpers · Quick-Attach hardware · quick-release hinges · 1-year warranty
A KOHLER plastic seat with Quiet-Close, Grip-Tight bumpers that stop it sliding, Quick-Attach hardware and quick-release hinges — and a fit for compact elongated bowls too.
Best for: A KOHLER or other compact elongated toilet, where a standard elongated seat would overhang
≈ $31
Non-electric bidet attachment · metal-ceramic valve cores, steel hoses · retracting nozzles behind a guard gate
A non-electric bidet attachment with retracting nozzles behind a guard gate and steel hoses.
Best for: Anyone whose first question about a bidet is where the nozzle sits between uses
≈ $40
Add a few drops of food coloring to the tank and wait twenty minutes without flushing. Color in the bowl means the flapper or flush valve is passing water. No color, but the tank still refills by itself, points to the fill valve or a water level set above the overflow tube.
Look at the drain opening at the bottom of the tank, under the flapper. Most toilets made in the last twenty years use 3-inch valves; older ones often 2-inch. The two flappers are not interchangeable, so measure before ordering.
Usually not enough water reaches it: a flapper closing too early, a water level set too low, or rim holes blocked with scale. Check the tank level against the line on the overflow tube before buying anything.
To replace a flapper, no. To replace a complete flush valve, usually yes; the Fluidmaster PerforMAX and Danco HydroRight on this list are designed to go in without taking the tank off.
A non-electric attachment slides between the bowl and your existing seat and tees off the cold supply at the shutoff valve. It needs no outlet. Check there is room for the side arm and that your seat sits flat on it.
Right for: A high-efficiency 3 in toilet that needs a flapper tuned to flush properly, with cover for a decade
Its best quality: Ten years of warranty on a flapper, which is the longest cover anywhere on this shelf and remarkable on a rubber part
Its main catch: Four dollars ninety-one more than the Korky flapper beside it, which publishes a stainless steel chain this does not
Right for: A leaking two-inch flush valve, measured first — the cheapest complete repair on this shelf
Its best quality: A complete valve seat and flapper for $11.99, a cent more than the Korky flapper alone and less than the $16.89 Fluidmaster flapper on this shelf
Its main catch: Returns will not be honored, so ordering the wrong size costs you the money
Right for: An older 1.6 to 3.5 GPF toilet with a 2 in valve, where halving the water is worth twenty minutes
Its best quality: The only product on this shelf that changes what the toilet does rather than restoring it, and it publishes real figures for the saving
Its main catch: Will not fit Mansfield toilets, which the listing states — and Mansfield’s own valve is two products away on this shelf
Right for: A KOHLER or other compact elongated toilet, where a standard elongated seat would overhang
Its best quality: Fits compact elongated bowls as well as standard elongated, the only seat here that says so
Its main catch: Plastic hinges, color-matched rather than metal
Right for: Anyone whose first question about a bidet is where the nozzle sits between uses
Its best quality: A guard gate with nozzles that retract behind it — the most convincing hygiene arrangement published on this shelf
Its main catch: Three bullets: no thickness, no pressure control described, no toilet compatibility and no nozzle count
$12 – $25
6 models
$26 – $37
8 models
$40 – $119
6 models
Side-by-side pieces already published on two fittings from this guide or this aisle.
The fittings listed come from this catalog of this site. Specifications are the published ones, from the maker and from the Amazon page; prices are what Keepa reported on the date below, and both move over time. The order uses declared specifications, the balance between stated strengths and stated limits, and price. No fitting here has been installed or tried by us, and the page does not claim it was.
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