A toilet that runs nonstop, refills forever, or won’t shut off is one of those household headaches you can’t ignore. Inside the tank, the fill valve is the part that controls how water flows in after each flush. When it fails, you waste water and listen to that phantom hiss all night. The picks below cover direct replacement parts, universal models, and full repair kits, so you can match the right fix to your tank.
A Snapshot Of The Selections
Duravit Starck 3 Fill Valve 1.6 GPF
Fluidmaster 703AP4 Fill Valve for Glacier Bay & Niagara Toilets
Fluidmaster 400H Universal Toilet Fill Valve
Geberit Type 383 Fill Valve for Flush-Mounted Cisterns
Geberit G240700001 8 in. Fill Valve with Brass Nipple
Fluidmaster PerforMAX 2-Inch Toilet Repair Kit
Fluidmaster PerforMAX 3-Inch Toilet Repair Kit
TECE 9820353 Adjustable Filling Valve
More On The Choices That Made The List
When the toilet in question is a Duravit Starck 3, going with the manufacturer’s own replacement valve usually saves you a guess. This unit is built as a direct swap for that specific one-piece model, rated at 1.6 gallons per flush (GPF), the standard single-flush volume for many modern tanks. The supply nipple is a 15/16-inch plastic bottom-feed design meant to match the original plumbing layout inside the tank.
Compared with the universal Fluidmaster picks later in this list, this valve isn’t trying to fit everything; it’s trying to fit one toilet perfectly. For a homeowner with a confirmed Starck 3 tank, that narrow focus is exactly the point, since aftermarket parts sometimes require fiddling with shims or height adjustments that the OEM piece simply avoids.
Well-Handled Touches
- Designed as an original-spec Duravit part, which removes the trial-and-error of fitting a generic valve into a Starck 3 tank.
- 1.6 GPF single-flush rating keeps water use aligned with the original toilet design.
- Plastic 15/16-inch bottom-supply nipple matches the factory plumbing path, cutting down on adapter work.
Points To Note
- Only fits Duravit Starck 3 one-piece toilets, so it has almost no value for any other brand or model.
- No installation instructions are listed in the packaging details, so you may need the toilet’s manual handy.
Whose Shelf It Belongs On
Owners of a Duravit Starck 3 one-piece toilet who want a guaranteed factory-spec replacement rather than a universal workaround.
A Better Fit Elsewhere
If your tank is anything other than a Starck 3 one-piece, the Fluidmaster 400H Universal Toilet Fill Valve is a far more useful pick.
Flapperless toilets from Glacier Bay and Niagara have a reputation for quirky refill behavior, and the Fluidmaster 703AP4 is engineered specifically to slot into those systems. It’s a direct replacement for the original valve in those tanks, which means you’re not adapting a universal part to a non-standard design. The included instructions make it approachable for someone tackling a tank repair for the first time.
Where the Duravit valve above targets a single premium toilet line, this one targets a pair of flapperless systems sold widely at home centers. In most cases, swapping the original valve with this Fluidmaster part restores the original refill speed and water-level behavior, which matters because flapperless tanks rely on precise fill timing to seal correctly.
What Makes Sense
- Built as a direct replacement for Glacier Bay and Niagara flapperless tanks, so installation lines up with the factory layout.
- Instructions are included, which lowers the barrier for first-time DIYers.
- Designed to restore original factory refill performance, useful if the current valve has become sluggish or noisy.
Where It Is Less Suited
- Compatibility is limited almost entirely to those two brands, so it won’t help anyone outside that niche.
Feature Snapshot
The Right Fit
Shoppers with a Glacier Bay or Niagara flapperless toilet whose tank fills too slowly, runs constantly, or simply won’t shut off.
Where A Sibling Pick Shines
For a tank from any other brand, the Fluidmaster 400H Universal Toilet Fill Valve offers broader coverage in a single package.
The Fluidmaster 400H is the valve most people picture when they think “toilet repair,” and for good reason. It’s a universal replacement designed to fit most toilet brands and models, with adjustment dials on both the tank and bowl sides so you can dial in the water level you want. Step-by-step instructions ship in the box, which removes a lot of the guesswork for a first-time tank repair.
The pitch is high-performance refill with minimal noise, useful if your current valve hisses or takes forever to top off the tank. Unlike the Glacier Bay-specific Fluidmaster 703AP4 above, this unit trades narrow compatibility for broad reach. For a homeowner who isn’t sure exactly what valve they have, the 400H is often the safest single-part bet.
Strengths Worth Knowing
- Universal fit covers most major toilet brands, so you don’t need to identify a specific model before ordering.
- Tank and bowl water-level adjustment dials let you fine-tune flush volume to match your preferences.
- Step-by-step instructions are included, which is genuinely helpful for a first tank repair.
Things To Consider
- Universal fit means a little extra adjustment time compared to an OEM-specific valve like the Duravit Starck 3 part.
- Older tanks with unusual dimensions may still need a shim or adapter to seat the valve cleanly.
Key Product Details
Built With In Mind
Homeowners who want a single universal fill valve they can install without hunting down a model-specific part number.
Skip It When
If you own a Duravit Starck 3 one-piece toilet, the Duravit 0074114200 OEM valve is a tighter, factory-matched fit.
The Geberit Type 383 steps into a different category: in-wall, concealed cisterns (the hidden water tanks behind the push-plate in modern bathroom walls). It’s the successor to the older Type 380 and is built specifically for Geberit flush-mounted systems. A 3/8-inch brass threaded connection keeps the supply line solid, and the valve can plumb in from either the left or the right, which simplifies tricky remodels where the original supply side doesn’t match.
Low-noise operation is the standout feature here, since sound travels differently through a wall cavity than through an open tank. Geberit rates the line noise at just 7 dB(A) at 3 bar, which is the kind of figure that matters when the bathroom sits next to a bedroom. Compared with the open-tank picks above, this is firmly a specialist part for a specific plumbing system.
Where It Helps
- Designed for all Geberit flush-mounted cisterns, so it drops into the manufacturer’s own concealed-tank platforms.
- Left- or right-side supply connection gives flexibility during renovation or repair.
- 3/8-inch brass threaded inlet adds a solid, durable supply joint that resists cross-threading.
- Rated for low-noise operation, useful in bathrooms next to quiet spaces.
Worth Bearing In Mind
- Only fits Geberit concealed cisterns, so this is a niche pick rather than a household staple.
- Working inside a wall cavity requires access through the push-plate and a bit of confidence with hidden plumbing.
Quick Facts
Who Should Grab It
Homeowners or pros servicing a Geberit in-wall cistern who need a direct, factory-compatible replacement valve.
Look Elsewhere When
If your toilet is a standard exposed-tank model, the Fluidmaster 400H Universal Toilet Fill Valve is a better everyday tool.
This 8-inch Geberit fill valve is built around a lateral water supply connection, meaning the supply line enters the tank from the side rather than from the bottom. That’s a configuration common in certain older and European-style Geberit tanks. The included brass nipple is a real upgrade over the plastic nipples you find on many replacement valves, since brass resists wear, corrosion, and over-tightening far better.
Pair it with the quiet-running Geberit Type 383 above and you start to see a Geberit-specific ecosystem emerging in this list. The Type 383 is for in-wall cisterns; this G240700001 is more often the right call for tanks where the supply line approaches from the side. That specificity is both the strength and the limitation here.
Where It Excels
- Brass supply nipple adds long-term durability over plastic alternatives.
- 8-inch length suits tanks where the supply enters laterally.
- Geberit OEM design supports reliable fit on compatible tanks.
Honest Caveats
- Only fits Geberit tanks with a lateral supply layout, so it’s not a universal solution.
- Manufacturer documentation around adjustment steps is light, so you may need to work from the toilet’s service guide.
Who It Suits Best
Anyone maintaining a Geberit tank with a side-fed supply line who wants a brass-nipple replacement that should outlast plastic parts.
Consider Something Else When
For a broader fit across many toilet brands, the Fluidmaster 400H Universal Toilet Fill Valve is a more flexible pick.
The PerforMAX 2-inch kit takes a different angle from the standalone valves above. Instead of selling you a single fill valve, it bundles the parts needed to overhaul a 2-inch flush-valve tank in one box. That includes the fill valve, the flush valve, and the related seals you’d otherwise have to track down separately. For a tank that’s been running, ghost-flushing, or sweating through multiple worn parts, an all-in-one kit is often the most efficient route.
The 2-inch flush valve refers to the central opening at the bottom of the tank; that’s the standard size in most residential toilets, while 3-inch versions (covered next) are found in higher-flow systems. Compared with the Fluidmaster 400H valve alone, this kit gives you a full tank refresh rather than a single part swap.
Everyday Advantages
- Bundled kit removes the need to buy fill valve, flush valve, and seals separately.
- Targeted at the common 2-inch flush valve size, so it fits most standard residential toilets.
- All-in-one approach simplifies a single repair trip and a single purchase decision.
- Useful when the original tank parts are all aging together and a full refresh is more practical than part-by-part replacement.
Practical Considerations
- Only suits 2-inch flush valve tanks, so a quick tank inspection is needed before ordering.
- Replacing more parts at once increases the time the toilet is out of service during the swap.
Feature Rundown
Made For
Homeowners dealing with multiple worn tank parts at once on a 2-inch flush valve toilet who want one kit instead of several orders.
Not Your Match When
If your tank uses a 3-inch flush valve, the Fluidmaster PerforMAX 3-Inch Toilet Repair Kit is the kit designed for that opening.
The 3-inch version of the PerforMAX kit covers a less common but important tank layout. A 3-inch flush valve opening moves more water per cycle, which shows up in toilets designed for higher flow or commercial-style flushing performance. Like the 2-inch kit, it bundles everything needed to rebuild the tank in one purchase, so you can plan a single repair session.
Compare that with the Fluidmaster 400H universal valve, which is just the fill valve. This kit goes further by including the flush valve and tank hardware. For homeowners who know their toilet uses a 3-inch flush valve and want to refresh the whole tank at once, the bundle approach saves both time and second-guessing.
Key Advantages
- Built specifically for the less common 3-inch flush valve layout, so parts match without improvising.
- Bundled kit means one order covers the fill valve, flush valve, and supporting hardware.
- Useful when a single part swap hasn’t solved a chronic tank issue and a full rebuild is the next step.
Things To Weigh
- Not interchangeable with 2-inch tanks, so the wrong size kit simply won’t seat correctly.
- More parts to replace means a slightly longer install time than a single-valve swap.
Best Suited To
Homeowners with a 3-inch flush valve toilet ready for a full tank refresh rather than a single part swap.
Another Choice May Suit
If your toilet uses a standard 2-inch flush valve, the Fluidmaster PerforMAX 2-Inch Toilet Repair Kit is the better-sized bundle.
The TECE 9820353 closes the list with a compact filling valve built for TECE cisterns, though it also fits a wide range of other flush-mounted and surface-mounted tanks from competing brands. The headline features are a manually adjustable filling height, low-noise operation, and a small footprint that helps when space inside the tank is tight. A 3/8-inch metal connection thread and included adapter round out the install package.
Where the Geberit Type 383 above targets only Geberit in-wall systems, this TECE valve positions itself as a cross-compatible option for several European-style concealed cisterns. For a remodel that didn’t originally use TECE but ends up with one of these valves, the included adapter is what makes that swap realistic.
Useful Highlights
- Manually adjustable filling height lets you tune the water level for different tank geometries.
- Compact body fits in tight tank spaces where larger universal valves won’t sit cleanly.
- Quiet refill operation suits bathrooms near quiet rooms.
- 3/8-inch metal connection thread and included adapter ease supply hookup across systems.
Details To Watch
- Best suited to TECE and similar European-style cisterns, so always confirm tank compatibility before ordering.
- Adjustment screws inside the tank may need a careful hand on slim, hard-to-reach fill-height dials.
Perfect Match For
Installers and homeowners working with TECE cisterns or similar flush-mounted systems who want an adjustable, compact replacement valve.
Reach For A Different Pick When
If you have a Geberit-specific in-wall cistern, the Geberit Type 383 Fill Valve is the more direct factory-aligned replacement.
What To Weigh Before Choosing Toilet Fill Valves
Match The Valve To The Tank Type
The single biggest decision is whether you need a universal valve or a brand-specific one. Universal valves like the Fluidmaster 400H cover most exposed-tank toilets and are forgiving if you don’t know the exact model. Brand-specific valves like the Duravit Starck 3 part or the Fluidmaster 703AP4 are tighter fits for known systems. For in-wall, concealed cisterns from Geberit or TECE, you generally need a valve designed for that concealed platform, since the supply connection and noise expectations differ from a standard tank.
Decide Between A Single Part And A Full Kit
If only the fill valve is acting up, replacing just that part is the lightest-touch repair. If the flush valve, flapper, and seals are also aging, a bundled kit like the Fluidmaster PerforMAX 2-Inch or 3-Inch kit handles the whole tank in one go. Kits cost more upfront but avoid the all-too-common situation of fixing one part only to discover the next one fails a week later.
Look At Noise, Adjustment, And Connection Material
A quieter valve matters most in bathrooms near bedrooms. Brass-threaded supply connections tend to outlast plastic ones, especially on fittings that get touched during maintenance. Adjustable water-level dials help when you want to fine-tune flush volume, and a compact body matters in shallow or unusually shaped tanks. Each of those traits maps to a different reader profile, from light sleepers to remodelers working with slim concealed cisterns.
Smart Considerations Across These Picks
Mistakes Worth Dodging
Buying a universal valve when your tank needs a brand-specific part usually ends with shims, leaks, or a valve that simply won’t seat. The flip side is buying a Duravit, Geberit, or TECE-specific valve for a toilet that uses a different system, which leaves you with a part that fits nothing in your house. Before ordering, check the toilet’s brand and model number, and confirm whether the tank uses a 2-inch or 3-inch flush valve if you’re considering a full kit.
Where The Extra Money Goes
Higher-tier valves in this category typically buy quieter refill cycles, brass instead of plastic supply connections, and tighter brand-specific tolerances. For a household bathroom used a few times a day, a mid-range universal valve is often plenty. The upgrade earns its keep in noise-sensitive spaces, in-wall systems where the wrong part means opening the wall twice, or older tanks where a brass-nipple valve simply lasts longer between service visits.
Frequently Asked Questions
How Do I Know Which Toilet Fill Valve I Need?
Start by checking the toilet’s brand and model number, usually stamped inside the tank or on the bowl’s underside. Universal valves fit most exposed tanks, while concealed cisterns from Geberit or TECE need valves built for those systems. If you’re unsure, the Fluidmaster 400H is a safe universal starting point.
Are Universal Fill Valves Hard To Install?
Most universal valves ship with step-by-step instructions and only need basic hand tools. The job usually involves shutting off the water, draining the tank, swapping the valve, and adjusting the float. Most first-time DIYers finish the swap in under an hour with no plumber required.
What Is A 2-Inch Vs 3-Inch Flush Valve?
The flush valve is the central opening at the bottom of the tank that releases water into the bowl. A 2-inch flush valve is the most common residential size, while 3-inch versions move more water per cycle. Choosing the wrong size kit means the flush valve won’t seat correctly inside the tank.
Can I Replace Just The Fill Valve Instead Of The Whole Kit?
Yes, if the fill valve is the only part showing problems like hissing, slow refill, or constant running. If the flush valve, flapper, and seals are also worn, a full kit like the Fluidmaster PerforMAX bundle is more efficient. Inspect the other tank parts before deciding which route to take.
Why Are Concealed Cistern Valves Different?
Concealed cisterns sit inside the wall, so the valve has to operate quietly and connect through a tight space. Brand-specific valves like the Geberit Type 383 and TECE 9820353 are designed for those constraints. Using a standard tank valve in a wall system usually results in poor fit or excess noise.
Final Verdict
For most exposed-tank repairs, the Fluidmaster 400H Universal Toilet Fill Valve is the practical go-to, while the PerforMAX kits make sense when more than one tank part is failing. Brand-specific picks like the Duravit Starck 3 valve, the Fluidmaster 703AP4, the Geberit Type 383, and the TECE 9820353 each solve a narrower problem cleanly. Match the valve to your toilet first, then decide between a single part and a full kit, and you’ll avoid most of the usual headaches.
