Best Toilet Fill Valves of 2026

The Fluidmaster 400A is the fill valve we recommend to almost everyone because it is the part the rest of the category is measured against. It is the most widely sold anti-siphon fill valve in North America, fits nearly every standard toilet, adjusts in seconds, and is stocked in every hardware store, so when a toilet runs this is the safe, no-research repair.

The reason it works is the float-cup design Fluidmaster popularized: instead of a brass arm and a float ball that hangs across the tank, the float is a cup that rides up and down the valve body itself. That makes it quieter, more compact and far less prone to the sticking and drift that plagued old ballcocks. The height adjusts by twisting the shank to telescope the body between roughly 9 and 14 inches, covering the vast majority of tanks, and the water level is set with a simple clip on the float. The whole thing seats on one hand-tightened shank nut, so no wrench is strictly required and there is little to get wrong.

Owners consistently describe the 400A as the valve that finally stopped a running toilet in fifteen minutes, with the universal fit and everywhere-availability drawing the most praise across hundreds of thousands of reviews. Because it is the default repair, replacement parts and seals are trivial to find years later. The trade-offs are minor: its refill is normal speed rather than the rapid fill of the PerforMAX, and very tall tanks can exceed its 14-inch reach. As the safe, proven, universally available fix, nothing else is an easier recommendation.

The Fluidmaster 400AH PerforMAX is the upgrade pick, taking the proven 400-series design and engineering it for a faster, quieter fill and a wider fit. It refills the tank up to twice as fast as a standard valve and adjusts across a taller 10 to 15 inch range, making it the choice for big tanks and for anyone tired of waiting for the toilet to be ready again.

The PerforMAX uses a larger internal flow path and a refined seal to move more water per second, which is what cuts the refill time roughly in half on a typical tank while keeping the operation quiet. The taller 10 to 15 inch adjustment covers high-tank and large-capacity toilets that can stretch a standard 400A, and it keeps the same one-nut universal install and anti-siphon code compliance. It is, in effect, the 400A engineered for performance, so it suits anyone who found a standard valve slow or who has a tank a basic valve cannot reach.

Owners praise how quickly the tank is ready again between flushes and how quiet the fill is compared with the valve they removed, with several noting it solved a tall-tank fit a standard valve could not. The faster fill is most noticeable in busy households. The trade-offs are small: it costs a little more than the plain 400A, and the rapid-fill benefit shrinks in homes with weak water pressure, where the supply, not the valve, sets the speed. For the fastest, quietest fill in the lineup, it is the clear pick.

The Korky 528 QuietFILL is the value benchmark and the quiet specialist. Korky engineered the refill path to run noticeably quieter than a standard valve, and the QuietFILL fits a wide range of tanks while costing little, making it the easy no-stress swap when a toilet runs or hisses.

The QuietFILL name describes the engineering: Korky shapes the water exit to break up the rushing-water sound that makes a refilling toilet so noticeable, especially in a small or shared bathroom. The valve twists between 7.5 and 13.5 inches, so it shortens further than many rivals for compact and low-profile tanks while still reaching standard ones. It is anti-siphon and code listed, installs tool-free on a hand-tightened nut, and Korky backs it with a long warranty, all at a price that makes outfitting several toilets at once painless.

Owners single out how much quieter the toilet became after the swap and how cheap and quick the fix was, with the wide-but-short height range solving compact-tank fits that a taller-only valve cannot. It is a genuine Fluidmaster alternative that many prefer for noise alone. The trade-offs: Korky is slightly less ubiquitous than Fluidmaster for finding parts in a pinch, and the fill is standard speed rather than the rapid fill of the PerforMAX. For a quiet, inexpensive, easy repair, it is the standout value.

The Fluidmaster 400CR is the do-it-once kit, pairing the proven 400A fill valve with a matching flapper so you replace both wear parts of the tank in a single repair. When a toilet both runs and ghost-flushes, the cause is often a tired valve and a tired flapper together, and this kit fixes both at once.

The logic of the kit is that the fill valve and the flapper are the two parts that wear, and they tend to wear together. The 400CR pairs the same universal 400A valve with a flapper sized for the common 2-inch flush valve, so one purchase and one fifteen-minute session refreshes the whole tank. Both pieces install tool-free, the valve adjusts 9 to 14 inches as on the standard 400A, and the included flapper takes the guesswork out of matching a separate replacement. For an aging toilet it is the efficient choice that heads off a second repair a month later.

Owners value getting both wear parts in one box and fixing a toilet that was both running and randomly refilling in a single go, with the universal fit and tool-free install drawing the usual praise. The only caveats are situational: if your flapper is genuinely still good you pay a little for a part you may not need, and toilets with an unusual flush valve seat may want a flapper matched to that seat instead. As a complete, do-it-once tank repair, it is the standout. If only the flapper is failing, see our guide to the best toilet flappers of 2026.

The Korky 528MP QuietFILL Platinum is the heavy-duty version of Korky's quiet valve, built with metal-shank durability and a tougher seal to resist the wear and hard-water grit that shorten a basic valve's life. It pairs the same quiet refill with a build meant to last, for buyers who want to fix the toilet once and forget it.

The Platinum upgrades the standard 528 with a sturdier metal-reinforced shank and a more robust internal seal designed to shrug off the mineral grit that wears out the rubber and plastic in cheaper valves. It keeps the quiet-fill path and the wide 7.5 to 13.5 inch adjustment, so it fits and quiets the same tanks while lasting longer in punishing water. Korky backs it with one of the longer warranties in the category, which signals the confidence behind the heavier build. For a hard-water home where valves seem to fail every couple of years, the extra durability pays for itself.

Owners in hard-water areas praise how long the Platinum lasts compared with the valves they kept replacing, along with the quiet operation and the easy install. It feels more solid in the hand than a basic valve. The trade-offs are simple: it costs more than the standard 528, and in a soft-water home a basic valve may last nearly as long, making the premium less necessary. Where water is hard, though, it is the most durable quiet valve here.

The Fluidmaster B1G2 is the universal-fit specialist, an adjustable anti-siphon valve sold as the all-purpose answer for unknown or odd tanks. When you are not sure exactly what your toilet takes, this is the valve built to fit the broadest spread of standard tanks with the least fuss.

The B1G2 is essentially Fluidmaster's universal-fit valve, twisting across the same dependable 9 to 14 inch range as the 400A and sharing the float-cup reliability, but positioned as the keep-one-on-hand answer for any toilet. Its strength is breadth: it fits the standard tanks of nearly every brand, installs tool-free on a single nut, and meets anti-siphon code, so a landlord or handyman can stock one valve and fix almost any running toilet they meet. It is the pragmatic choice when you do not know, or do not want to look up, exactly what the toilet originally used.

Owners value it as the valve that fit when they were not sure what they needed, with the tool-free install and broad compatibility earning the most mentions. It is a favorite of people who maintain several toilets. The caveats are familiar: it is a standard-speed fill rather than a rapid fill, and brand purists with a specific OEM toilet may prefer the matched factory part. As the buy-it-and-it-fits universal valve, though, it is hard to beat.

The Kohler GP1083167 is the genuine factory fill valve for many Kohler toilets, the right answer when you want an exact OEM match rather than a universal substitute. For Kohler tanks engineered around a specific fill valve, the factory part drops in cleanly and preserves the toilet's intended behavior.

The case for an OEM valve is fit and predictability. Kohler designs some tanks around the dimensions and flow of a specific fill valve, and dropping in the genuine GP1083167 means the height, the water level and the refill behave exactly as the engineers intended, with no fiddling to match a universal part to a non-standard tank. It is anti-siphon like the universal valves, installs as a direct replacement, and removes the guesswork of whether a generic valve will sit right in a Kohler tank. For a Kohler owner who values an exact match, it is the cleanest repair.

Owners with Kohler toilets praise the drop-in fit and the confidence that the factory part will behave correctly, avoiding the trial-and-error some report when forcing a universal valve into a particular Kohler tank. The trade-offs are clear: it costs more than a universal valve and only suits the Kohler models it is made for, so it is not the pick for a mixed-brand household. For a Kohler tank specifically, though, the genuine part is the surest fit.

The Fluidmaster 400CRP14 adds a cleansing or filtered design to the proven 400-series valve, aimed at homes where mineral grit and sediment foul a normal valve. It is the pick for hard-water and well-water tanks, where keeping debris out of the seal is the difference between a valve that lasts and one that fails in a season.

The 400CRP14 keeps the universal 400-series fit and the 9 to 14 inch adjustment but adds a design tuned to handle sediment and mineral debris, the leading cause of fill valves that begin to leak or refuse to shut off in hard or well water. By keeping grit away from the sealing surface, it stays reliable where a basic valve clogs and weeps. It installs the same tool-free way, meets anti-siphon code, and is the sensible choice for anyone who has watched ordinary valves fail repeatedly because of their water. For most municipal supplies it is more valve than needed, but for problem water it earns its keep.

Owners on well water and in hard-water regions praise how much longer it lasts than the standard valves they kept swapping, crediting the debris-resistant design with ending a cycle of repeat repairs. It installs exactly like any 400-series valve. The trade-offs are minor: it costs a little more than a plain 400A, and in soft-water homes with no debris problem the extra design buys little. Where water is hard or sediment-laden, though, it is the most dependable choice here.