A toilet that runs, refills slowly, or bangs against the tank can turn a small repair into a daily nuisance. The right fill valve depends on your toilet model, tank layout, and connection size, so you need to match the component carefully before lifting the tank lid. These options cover model-specific replacements, universal fittings, compact tanks, and complete smart-toilet upgrades.
A Snapshot Of The Selections
WDI AquaSource Fill Valve for 1.28 GPF Toilets
Fluidmaster PRO400UK 1/2-Inch Fill Valve
Fluidmaster PRO45 Fill Valve
WDI B3260 Universal Fill Valve
EcoFlush B8106-03 Flush Valve Cartridge
Kohler Class Five Silent Fill Valve Kit
Casta Diva Smart Toilet with Foam Shield
Casta Diva K030 Smart Toilet with Bidet
The Picks, Examined More Closely
Exact model matching makes this the sensible choice for an AquaSource toilet that needs its original-style replacement. The valve supports Lowes part 710011 and WDI part B3834 across models 98923, 312795, 352027, 395280, and 12293, so identifying the tank can prevent an avoidable mismatch.
Its 1.28-gallon-per-flush designation matters because the valve is intended for that AquaSource family rather than every toilet on the market. The included refill tube, cone washer, and coupling nut cover the basic connection pieces, which helps keep the repair focused.
What Helps Most
- Specific compatibility across five listed AquaSource models simplifies model verification.
- The complete set includes the refill tube, cone washer, and coupling nut.
- It meets applicable plumbing standards in the United States and Canada.
Practical Considerations
- This is a model-specific replacement, so the tank number and part label need to match before purchase.
- It is not the broader-fit option offered by the WDI B3260 Universal Fill Valve.
Key Details
Who It Suits Best
You benefit most from this valve when your toilet carries one of the five listed AquaSource model numbers and you prefer a component-level repair.
A Better Fit Elsewhere
The WDI B3260 Universal Fill Valve suits you better when the tank is an older or newer model without a confirmed AquaSource part number.
A slow tank refill is often more noticeable in a busy home than a brief tank-filling sound, particularly when the toilet sits near a bedroom or hallway. The PRO400UK uses a bottom-entry float-valve arrangement, and its height adjustment gives you room to match the valve to the tank rather than forcing a fixed-size component into place.
The 1/2-inch brass shank is the connection point where water enters the valve, while the float rises and falls to control when filling stops. Compared with the WDI AquaSource valve, this model is not tied to a named toilet family, but its connection and tank clearance still need checking.
Notable Gains
- Adjusts from 9 to 14 inches for better alignment with different tank depths.
- The 1/2-inch brass shank supports common low- and high-pressure supply arrangements.
- Anti-siphon construction helps keep the tank from drawing contaminated water through the valve.
- The package contains the valve, locknut, sealing washer, and instructions.
Points To Note
- The bottom-entry layout and 1/2-inch shank must fit the existing tank connection.
- Its 9-to-14-inch adjustment is taller than the 8.25-to-12.25-inch range of the WDI B3260.
Feature Snapshot
Made For
This valve fits a handy homeowner dealing with a standard 1/2-inch connection who values adjustable height and a straightforward replacement.
Consider Something Else When
The Fluidmaster PRO45 Fill Valve is a closer fit for a compact tank where the taller PRO400UK adjustment range may be unnecessary.
Not every slow or noisy tank needs a universal assembly or a model-specific replacement. The PRO45 takes a more familiar route for standard household toilets, using adjustable height to help the valve fit beneath the tank lid while the float controls the water level.
Its anti-siphon design helps keep the fill path from acting as an unwanted channel for tank water. Unlike the PRO400UK, the product information does not identify a 1/2-inch brass shank, so you should inspect the existing connection before settling on this simpler replacement.
The Case For It
- Adjustable height supports installation in most standard toilet tanks.
- Anti-siphon construction adds separation from the toilet bowl contents.
- Its simple replacement format suits routine tank maintenance.
Small Caveats
- Confirm the inlet connection and tank clearance because exact fitting dimensions are not included here.
- Broad standard-toilet compatibility still leaves some older or unusual tanks to rule out.
- Compared with the WDI B3260, fewer dimensions are provided for judging a confined installation.
The Right Fit
This valve is a practical option for someone replacing a worn component in a conventional toilet and comfortable checking the connection dimensions first.
Look Elsewhere When
The WDI B3260 Universal Fill Valve serves you better when compact clearance and a clearly stated adjustment range are your main concerns.
A cramped tank can make an otherwise ordinary replacement more difficult, but the B3260 stays below 2.5 inches in diameter and adjusts from 8.25 to 12.25 inches. Those measurements make it a useful choice for older or modern toilets where the original part number is difficult to trace.
Its self-cleaning design is intended to resist sediment and mineral buildup in hard or dirty water, while the single adjustment simplifies positioning. Compared with the Fluidmaster PRO45, this valve provides clearer dimensional information, which matters when lid clearance is tight.
The Value In It
- A sub-2.5-inch diameter helps it fit small or restricted tank interiors.
- One adjustment is intended to simplify a typical 5-to-10-minute installation.
- Operation across low- and high-pressure settings broadens its household application.
- The self-cleaning design is made for mineral and sediment exposure.
- It works with most modern and older toilet tanks.
Details To Watch
- Your tank needs enough vertical and horizontal room for the 8.25-to-12.25-inch valve and its under-2.5-inch diameter.
- The model-specific WDI AquaSource valve remains preferable when its five listed model numbers match your toilet.
Feature Breakdown
Built With In Mind
This valve suits a homeowner with a tight or older tank who wants a compact universal replacement and one-adjustment setup.
Another Choice May Suit
The Kohler Class Five Silent Fill Valve Kit is a quieter, model-specific choice for a confirmed single-flush Class Five toilet.
This cartridge belongs in a different repair category from a standard tank fill valve. It fits selected EcoFlush pressure-assisted units, including the B8104, B8106, B8106S, B8105, and B8204 families, making it useful for commercial-style flushing systems where replacing the entire pressure vessel would be excessive.
The top-access design lets you remove the worn cartridge without dismantling the whole toilet tank. The included removal tool, O-rings, and instructions also reduce the chance of ordering loose service pieces separately, though the existing unit model remains the first compatibility check.
What Makes Sense
- Repairs the internal flushing mechanism without replacing the complete pressure vessel.
- High-impact plastic and rubber O-rings suit repeated commercial-grade use.
- Top-access installation avoids complex tank disassembly.
- The service kit includes the cartridge, seals, removal tool, and instructions.
Possible Compromises
- Compatibility is limited to the listed EcoFlush pressure-assisted families, not ordinary toilet tanks.
- The product replaces a flush cartridge rather than the tank’s fill valve.
- Professional installation or prior experience is advisable because the unit is more specialized.
Who Will Love This
This repair suits a facilities worker or experienced homeowner maintaining a confirmed EcoFlush pressure-assisted toilet with recurring cartridge wear.
Reach For A Different Pick When
The WDI B3260 Universal Fill Valve is the more practical choice for a standard gravity-fed toilet with a worn fill valve.
A noisy fill cycle stands out most at night or in a bathroom beside a bedroom. This Kohler kit focuses on quieter tank filling for single-flush Class Five canister toilets, so the strongest case for it is a confirmed model match rather than a generic replacement claim.
The kit includes a 12.5-by-3.5-inch fill valve and a canister seal. Compared with the WDI B3260 Universal Fill Valve, the Kohler is narrower in its intended application, but that specificity can be an advantage when your toilet and existing hardware are clearly identified.
Real Benefits
- Quiet filling reduces the nighttime disturbance created by a loud refill cycle.
- The included canister seal supports a coordinated Class Five repair.
- Its defined 12.5-by-3.5-inch size helps you check tank clearance.
Trade Offs
- The kit is intended for single-flush Class Five canister toilets rather than a broad range of tank designs.
- Confirm the toilet model and available tank space before ordering.
At A Glance
Whose Shelf It Belongs On
This kit is right for a Kohler Class Five owner who values a quiet refill and has confirmed the canister-toilet configuration.
Skip It When
The WDI B3260 Universal Fill Valve is the safer fit for a mixed collection of toilets or an unidentified tank needing broad dimensional guidance.
Sometimes a leaking or noisy valve is only one part of a larger bathroom problem, and replacing the whole fixture opens the door to automatic features. The Casta Diva is a one-piece smart toilet with a built-in bidet, automatic lid movement, and a foam barrier designed to reduce splashing, sticking, and odor transfer.
Its automatic behavior suits someone who prefers a hands-light approach: the lid opens as you approach, while foot-kick operation controls the seat and lid and activates the flushing function. Compared with the WDI B3260, this is a major fixture change rather than a tank-component repair.
Practical Advantages
- Automatic opening and foot-kick control reduce the need to reach for controls.
- The Foam Shield creates a protective barrier during use.
- The built-in bidet combines several fixture functions in one design.
- Round-the-clock support adds a service contact for setup questions.
Factors To Consider
- This is a complete one-piece toilet, not a replacement fill valve for an existing tank.
- Accidental-damage coverage varies by plan, so review the terms rather than treating it as a standard replacement policy.
- Confirm your bathroom layout and full-fixture requirements before committing to this upgrade.
Built For
This model fits a renovation project where automatic operation, bidet functionality, and splash control matter more than preserving the existing toilet.
Where Another Pick Shines
The Casta Diva K030 Smart Toilet with Bidet suits you better when flush-system performance takes priority over the Foam Shield feature.
The K030 approaches the category from the fixture side, combining a built-in tank, automatic bidet functions, and a flush system rated at 1,000 grams of MaP. MaP stands for maximum performance, a rating associated with the toilet’s waste-removal performance rather than tank volume or water pressure.
Its integrated tank is described as operating without water-pressure restrictions, which may suit households with an older supply arrangement. Compared with the Casta Diva Foam Shield model, the K030 emphasizes flush performance and sensor controls rather than a foam-based splash barrier.
Noteworthy Benefits
- A 1,000-gram MaP rating gives buyers a defined flush-performance figure.
- The built-in tank avoids dependence on a separate conventional tank assembly.
- Automatic lid operation adds convenience in a frequently used bathroom.
- Support is available around the clock for setup and operating questions.
Some Limits To Know
- Replacing a working toilet with a complete smart fixture is a much larger project than swapping a fill valve.
- Plan details for accidental-damage coverage vary, so check the applicable terms.
- No overall toilet dimensions are provided here, making a layout check an important pre-purchase step.
Technical Highlights
Made For
The K030 fits a full bathroom renovation where an integrated tank, bidet features, and a stated flush rating shape the decision.
Not Your Match When
The EcoFlush B8106-03 Flush Valve Cartridge is a more practical option when you only need to service a compatible pressure-assisted toilet.
Match The Valve To Your Toilet
Start With The Existing Model
The tank label often provides the clearest starting point. Record the toilet brand, model number, and any part number printed near the valve, because those details distinguish a model-specific replacement from a broader universal option. The WDI AquaSource valve, for example, fits five named models, while the WDI B3260 is intended to cover a wider range of modern and older tanks.
Measure The Space And Connection
Fill valves need room for their body, float, outlet, and refill connection. The B3260 is less than 2.5 inches wide and adjusts from 8.25 to 12.25 inches, while the Fluidmaster PRO400UK spans a 9-to-14-inch height range. Check the inlet size and bottom-entry or top-entry layout before ordering, since a broad toilet compatibility claim cannot replace a physical connection check.
Decide Whether You Need A Repair Or A New Fixture
A fill valve controls the tank’s refill process, whereas a flush valve controls how stored water enters the bowl. The EcoFlush B8106-03 belongs to the second category and only fits selected pressure-assisted systems. The two Casta Diva options go further, replacing the toilet with a complete smart fixture, so they belong in a renovation decision rather than a routine tank repair.
The Details That Prevent A Mismatch
Common Shopping Slip Ups
Do not rely on the word “universal” without checking tank dimensions, inlet size, and connection style. A valve can fit beneath the lid yet still fail to align with the refill tube or supply shank. Also confirm the toilet model before buying the EcoFlush cartridge, since its compatibility list is much narrower than that of a standard tank valve.
Where The Extra Money Goes
Premium positioning often comes from quieter operating design, specialized compatibility, sediment resistance, or added automatic functions. Those features make sense when noise is a daily issue, your water leaves visible deposits, or you are replacing the entire fixture. A basic adjustable valve remains the more rational choice for a straightforward repair in a common toilet.
Frequently Asked Questions
How Do I Find The Correct Toilet Fill Valve?
Check the model and part numbers inside the tank, then compare them with the replacement’s supported models and dimensions. A photograph of the old valve and its connection can also help you identify the correct fit.
Is A Universal Toilet Fill Valve Always The Easiest Option?
No, because universal models still have height, diameter, and connection requirements. A named model-specific valve can be easier to select once you have confirmed the toilet number.
What Is The Difference Between A Fill Valve And A Flush Valve?
A fill valve refills the tank after a flush, while a flush valve releases tank water into the bowl. The EcoFlush B8106-03 is a flush-valve cartridge, not a standard tank fill valve.
Can I Replace A Toilet Fill Valve Without Replacing The Whole Toilet?
In most standard tank designs, the fill valve can be replaced separately after the water supply is shut off and the tank is drained. Confirm compatibility and follow the installation instructions included with the chosen component.
Are Smart Toilets Better Than Replacing A Fill Valve?
A smart toilet makes more sense during a whole-fixture renovation, especially when automatic operation and a built-in bidet are priorities. For a single leaking or noisy valve, a compatible replacement component is usually the more focused repair.
Final Verdict
Start with the model number inside your tank, then check connection size and available space. The WDI AquaSource and Kohler kits suit confirmed models, the WDI B3260 handles broader tank fit, and the Fluidmaster valves serve common adjustable installations. The EcoFlush cartridge and two Casta Diva toilets solve different, larger problems, so match the component to the repair before making the purchase.