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Best Toilet Fill Valves Available Today

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Although we use the restroom every day, little thought goes into how toilets work.

They’re simply a convenience that everyone needs. But, when something goes wrong with your toilet, you start to realize that there are many parts that make up these trusted companions of ours.






TOTO TSU99A.X Adjustable Replacement Fill Valve Assembly For Toilet Tanks


Fluidmaster 400AH PerforMAX Universal High Performance Toilet Fill Valve


Kohler Genuine Part Gp1138930 Silent Fill Toilet Fill Valve Kit


Korky 528 Toilet Fill Valve


Fluidmaster 400CRP14 Universal Toilet Fill Valve Kit


American Standard 7381125-400.0070A Fluid Master 400A Universal Toilet Water Fill Valve

One common issue is a leaky toilet fill valve. If your toilet is constantly running water, this is a sign of a damaged or worn valve.

Not only does this affect the running of your toilet, but it can become a nuisance as you hear water flowing continuously, day and night.

This running water builds up pretty quickly and, if you leave it too long, you will likely see your water bill start to rise.

Although toilet fill valves should last up to five years, on average, they can clog up and leak over time due to their regular exposure to water.

If your toilet fill valve has decided to pack in, you may be wondering if it’s best to call a plumber or do it yourself.

Well, replacing your old fill valve is thankfully pretty simple. And, best of all, universal fill valves tend to be compatible with most toilets these days.

Moreover, if you have decided to fix your toilet yourself, we recommend repairing the toilet’s flapper as well.

Thankfully, most fill valves come as a kit which includes a flapper.

The only thing you need to do is research and select the best toilet fill valve for your toilet.

But, who has time for that? Well, we do! That is why we have done the research for you and found a selection of high quality toilet fill valves for you to consider below.

Had enough of that hissing and water filling up in your toilet every day? Take a look at our replacement valves below, so you can return your toilet to its former glory.

Toilet Fill Valve Product Reviews

TOTO TSU99A.X Adjustable Replacement Fill Valve Assembly For Toilet Tanks

First on our list today is this top-quality toilet fill valve from TOTO.

This TOTO TSU99A.X may not have the most catchy name in the world of toilet fill valves, but its performance is one of, if not, the best on the market.

Read any toilet fill valve guide, and you will almost always come across the TOTO brand, thanks to its excellent reputation and reliable products. 

This fill valve is easy to install and, once in place, will ensure that your toilet flushes efficiently every time.

Adjustable and versatile, this TOTO valve can fit all TOTO toilets thanks to its different heights.

In fact, it should fit most toilet types, but it is guaranteed to fit TOTO brands.

This valve has a traditional, universal inlet connection measuring 7-8 inches so, if your toilet is not made by TOTO, check whether this is compatible first. 

The TSU99A.X toilet fill valve will help your toilet refill quickly every time and improve its overall performance.

Water will stop trickling into your toilet once it reaches the right amount thanks to the sensitivity of this valve. So, that means, no more water flowing noises!

This toilet fill valve comes as part of a kit including a nut and cone washer, a clamp, and a toilet fill tubing.

Once you get it out of its packaging, installation is super easy, too.

If your toilet has refilling issues, the TOTO TSU99A.X fill valve will almost certainly fix the problem.

Use this valve, and you should see the last of leaking water and annoying noises.


  • Adjustable Height – fits all TOTO toilets and the majority of other brands
  • Easy To Install – no need to spend money on a plumber as you can set this up yourself
  • EcoPower Technology – this valve self generates hydropower, saving energy and money on bills


  • Only Available In The US And Some Selected Regions – if you need this to be shipped around the world, you will be disappointed

Fluidmaster 400AH PerforMAX Universal High Performance Toilet Fill Valve

To choose the best toilet fill valves, we tested each one to see if they could achieve one goal.

That was to see if the toilet would flush properly with no excess water building up.

One of the best in this ‘competition’ was the Fluidmaster 400H PerforMAX Universal High Performance Toilet Fill Valve.

This product comes with a universal fit and at a reasonable price. Compared to some other bigger brands such as American Standard, this Fluidmaster valve is somewhat cheaper.

In fact, as we delved into the world of toilet fill valves, we found that many of the bigger name brands simply use Fluidmaster valves before adding their own cap on top in order to raise the price. Sneaky! 

This toilet fill valve is also adjustable (10 to 15 inches). Therefore, it will fit a range of toilets from different brands.

Whether these are older versions, brand-new on the market, or dual flush models, the 400AH toilet valve from Fluidmaster should do the job.

We loved how this valve fills the toilet bowl quicker than most others thanks to its high-performance.

However, this does mean it can be a little noisier in comparison to less powerful valves.

Included with the toilet fill valve is a water-saving roller clamp.

This optimizes the amount of water used in the toilet, resulting in one of the most conservative toilet fill valves on the market.

The last thing you want is to start a new repair job soon after installing this fill valve.

But, with its 7-year warranty, you will be covered in case anything goes wrong. And, as for its setup, it couldn’t be easier!


  • Height Adjustable – you can adjust this toilet fill valve from 10 to 15 inches to fit a range of toilets
  • Includes A Water Saving Roller Clamp – saves water over time, meaning lower water bills.
  • Affordable – one of the highest-quality and cheapest toilet fill valves available


  • A Little Noisy – when refilling, the high-performance of this fill valve results in a bit of extra noise 

Kohler Genuine Part Gp1138930 Silent Fill Toilet Fill Valve Kit

One of the most renowned brands in the toilet industry, Kohler has been a reliable manufacturer for nearly 150 years.

Offering the highest quality products, Kohler toilet accessories tend to come with excellent warranties over many years and top-quality materials.

Our previous entry on the list, the Fluidmaster 400AH may come with some extra noise but this GP1138930 toilet fill valve is quite the opposite.

This is one of the quietest valves we have come across. So, if you’ve had enough of squeaky, piercing sounds emanating from your toilet, this silent fill valve will bring peace back into your home.

Versatile and efficient, this toilet valve kit is compatible with a range of toilets, and it comes with various fill rates, as well.

And, another benefit of using this is that it reduces overall water consumption, too. You know what that means – lower water bills!

Another key feature of this fill valve is its adjustability. You can change its height to make it fit a wide range of toilet tanks, but we recommend checking the color of your toilet tan before purchasing. This is best suited to gray toilet tanks. 

Just read countless reviews online, and you will see how satisfied customers are with the Kohler Gp1138930 toilet fill valve.

One constant finding is that this valve can last a long time. In fact, reports online state that the average lifespan of this valve is around 20 years, much longer than most of its competitors.

As well as its excellent longevity, the Kohler toilet fill valve is easy to install and can even stretch to up to 14 inches. 

High-quality and versatile, the Kohler Genuine Part Gp1138930 toilet fill valve is an excellent choice for sorting out your toilet’s refill issues once and for all.

Just remember to check your tank and inlets are compatible with it before buying.


  • Flexible And Versatile – can stretch up to 14 inches and is compatible with a wide range of toilets
  • From A Reputable Brand – Kohler are renowned for making high-quality products, so you know you’re getting the best
  • Long-Lasting – many toilet fill valves from Kohler can last up to 20 years, saving you money in the long run


  • Bit More Expensive – will need to spend more compared to some other brands

Korky 528 Toilet Fill Valve

Next up, we have one of the most affordable toilet fill valves on the market.

But, just because it’s cheaper doesn’t mean it’s lacking in quality. After extensive research, we found that the Korky 528 toilet fill valve is superb value for money.

In fact, it’s probably one of the best in its price range. 

Despite its low price, we did not come across any issues in terms of quality.

This fill valve has a universal fit meaning it should fit just about any toilet from new to old and two-piece to one-piece models. 

Although it is adjustable, it can stretch from 7.75 inches to 13.5 inches.

This allows you to get the ideal height for your setup, but you must make sure it fits your specific toilet properly. 

One outstanding feature is Korky’s QuietFILL technology. This helps your toilet run as quietly as possible, meaning no more strange sound in the middle of the night.

One drawback is that it fills a little slower than other fill valves, but needing to flush soon after the first flush shouldn’t be too much of a concern.


  • Affordable – great value for money and one of the cheapest on the market
  • Equipped With QuietFILL Technology – helps your toilet be as quiet as possible
  • Works For A Wide Range Of Toilets – fits one-piece and two-piece toilets, new and old


  • Slower Fill Than Some Other Toilet Fill Valves – can’t flush as quickly after a first flush as the valve needs time to fill back up

Fluidmaster 400CRP14 Universal Toilet Fill Valve Kit

Here, we have another top quality toilet fill valve kit from Fluidmaster.

This 400CRP14 toilet fill valve replacement set is a fantastic option as it is easy to install, comes with a universal, adjustable design, and is fully adaptable for many types of toilets.

This valve is designed to fit the majority of toilet tanks, whatever the brand.

Best of all, you can customize a variety of aspects with this device, such as its height and the amount of water flow it generates.

Overall, it is compatible with a diameter of between 9 and 14 inches. If that’s not versatile, we don’t know what it is!

When looking into any toilet fill valve, you should be inspecting how much water it can save you.

Thankfully, the Fluidmaster 400CRP14 is superior to many in this department.

For instance, it is possible to adjust the amount of water based on your toilet tank size. 

Within this set comes a repair kit and a flapper, so you can use it easily to fix cracks, running toilets, and damaged flappers.

Just bear in mind that the flapper is only suitable for valves that have a diameter of 2 inches.

As for installing the valve, it couldn’t be easier thanks to clear instructions.

Yep, no handyman required this time! If you have a little experience in fixing toilet fill valves, this job should take no longer than 15 minutes or so. 

Also included with this toilet fill valve is a 5-year guarantee. This is 4 years more than most of its competitors. 

All in all, the Fluidmaster 400CRP14 is compatible with tanks that have a cavity of 3.5 or more gallons.

If your toilet is currently noisy, leaking or very slow at filling, this toilet fill valve should be your magic remedy.


  • Easily Adjustable – can adjust the height to suit most types of toilets
  • Affordable – great value for money and cheaper than many of its competitors
  • Comes With A Repair Kit – includes a flapper as well to fix all kinds of problems with your toilet


  • Flapper Is Not The Best Quality – the included flapper only fits valves with a diameter of 2 meters and are not the most durable

American Standard 7381125-400.0070A Fluid Master 400A Universal Toilet Water Fill Valve

Our sixth choice today is this premium toilet fill valve from American Standard.

As the name suggests, this fill valve is suitable for all American standard toilets.

Not only that, but it has a universal fit, meaning it should fit most types of toilets, too.

If needed, you can also replace the ball floats that are found in older models of toilet tanks that tend to come with many issues.

As we mentioned earlier, many toilet fill valves are built on the Fluidmaster brand.

This American Standard model is a prime example. However, it costs almost double that of the Fluidmaster 400A.

From closer inspection, although the valve is of a great quality, you’re simply paying more for the name rather than the quality.

In all honesty, we can’t find much difference between this and the Fluidmaster 400A.

That being said, if you own an American Standard toilet, we suggest going with this toilet fill valve as you are guaranteed a compatible fit.

If not, think about your budget. If you’re prepared to spend more, go for this. But, if not, the Fluidmaster 400 should do just as good a job. 


  • Fits All American Standard Toilets – its universal fit should also be compatible with most other toilet brands
  • Excellent For Low-Flow Toilets – will improve the flow in many toilets
  • Can Replace Older Styled Ball-Floats In Toilet Tanks – will last longer and do a better job than older toilet ball-floats


  • Very Expensive – can get practically the same toilet fill valve from Fluidmaster for half the price 

Buyer’s Guide

While we have compiled a list of top-quality toilet fill valves above, we want you to take various factors into account before deciding what to look for.

Below is a list of factors that we considered when finding the best toilet fill valves. Keep these in mind when choosing your next fill valve.


Before agreeing to purchase a toilet fill valve, you must make sure that it will actually fit your toilet properly.

The last thing you want to do is take apart your toilet, spend money on a part, and then find that it doesn’t fit. 

You need to check if the valve you want to order is specific to a model or not. If so, it will only fit certain toilet brands.

In most cases, these valves are made by a manufacturer to fit their own toilets.

Therefore, you will need to continue spending money on their particular fill valves going forward. 

For instance, if you’re looking to buy a fill valve from brands such as American Standard or Kohler, check to see if the valve isn’t only for specific brands. 

With all this being said, the majority of fill valves are designed to be compatible with most toilets.

But, just because a toilet fill valve is advertised as universal, it doesn’t mean it will fit every single toilet.

To be sure, check how deep your toilet tank’s water reaches and then order a fill valve that can adjust to this height.

Many low-flow toilets, for example, are only capable of holding eight inches of water in their tanks.

If your fill valve can not adjust as low as this, it will not work, and you’ll be back in square one.

Conserving Water

You can find toilet fill valves that come with adjustable water conservation tools built in.

These allow you to adjust the way your toilet runs. Therefore, you can make it more efficient and save you money on water bills over time. 

These types of fill valves can often provide a significant reduction in your overall water usage.

Some are known to reduce water waste in toilet tanks by up to a whopping 38%.

Check your water bills over a period of time, and you should notice some pleasing savings. 

Your Toilet’s Operating Volume

Whenever you flush a toilet, you probably don’t think of the mechanism going on inside. That is, of course, until something goes wrong with the toilet.

Best Toilet Fill Valves Available Today

Every time you flush a toilet, the fill valve refills the tank with water, hence the imaginative name.

One thing most of us never think about is how loud this refill can be. Some toilets can be heard from other rooms as they refill, while others are as silent as an ant.

By using a quiet valve, you will certainly begin to notice the difference after every flush. 

Okay, we understand the noise level of your toilet flushing is not your primary concern but, in some cases, having a quieter toilet can help a lot.

Maybe you share a bedroom which has an en-suite. If your partner uses the bathroom every night and flushes it, you may get awoken by the sound of the tank refilling for a few minutes. Not with a silent fill valve!

Think about whether having a silent or quiet toilet fill valve is needed in your household. If so, it’s certainly worth investing in. 

Types Of Toilet Fill Valves

Altogether, there are 5 common toilet fill valve types. These are:

  • Piston ballcock/plungers
  • Diaphragm ballcocks
  • Diaphragm ballcocks (brass body)
  • Float cup fill valves
  • Floatless fill valves

Piston/Plunger Ballcock

These are one of the oldest types. Made from cast brass, they are super durable and operate very quietly or even silently.

As for their mechanical properties, these are pretty simple but very effective.

A floating ball is attached to a pivoting lever which opens and closes the plunger stem.

While these are generally excellent options, piston ballcock fill valves do not have anti-siphon protection.

They also do not meet the plumbing standards set in place today. If your toilet has one of these, we suggest replacing it with a newer model. 

Diaphragm Ballcock

This has a sizable floating ballcock that is lifted by the water level in your toilet tank.

It then closes the water inlet once the tank is full and opens when it is empty.

These valves also come equipped with a float rod adjustment screw to make them more flexible with different types of toilets. 

Diaphragm Ballcock (Brass Body)

This model is similar to the piston/plunger ballcock fill valve, as it has been around for a long time.

Made from either cast brass or plastic (in modern toilets), diaphragm ballcocks are still widely used due to their anti-siphon protection and efficiency.

This type is quite similar to the previous and has been in use for many years.

They can be made of cast brass or plastic (all modern toilet parts are plastic).

The reason for them to stay in use across the world is high efficiency and anti-siphon protection.

Float-Cup Fill Valve

Again, these fill valves have been around for a long time. In fact, float-cup fill valves were first introduced in the 1950s by Fluidmaster.

Their design includes an O-shaped groove that moves upwards and downwards with the toilet’s main shaft. This occurs thanks to the water.

The rod in this device can be adjusted to suit the water level of your toilet tank and its overall mechanism is very simple.

Thanks to its simplicity, a float-cup fill valve can generally be used in most modern toilets. This is also down to its adjustable-length shaft. 

Out of all the fill valves, the float-cup fill valve is the most commonly installed type.

Floatless Fill Valve

Floatless fill valves became popular in the 1990s thanks to their small size and easy installation process.

Best Toilet Fill Valves Available Today

These systems use a diaphragm that is highly sensitive to water pressure, so your water level never gets too high or too low.

These types also come with fewer moving parts in its mechanics but, compared to the float-cup, they are not used as much in today’s toilets. 

Frequently Asked Questions

Can You Repair A Toilet Fill Valve?

This depends on the fill valve model within your toilet, as some can be repaired whilst others need replacing altogether. 

For instance, Fluidmaster can be readily repaired in some circumstances, as you can simply replace the seal inside the valve.

This can sometimes do the trick. The same cannot be said of all brands, however.

If you have a brand that cannot be repaired, you will need to replace the entire mechanism.

How Do You Replace A Toilet Fill Valve?

In most cases, you will not need to call out a professional plumber to replace your toilet fill valve.

In general, you can do it yourself with ease. Here’s a brief rundown of how to do it:

  • Firstly, empty your tank completely.
  • Now, disconnect and remove the faulty fill valve.
  • Replace with the new fill valve.
  • Lastly, simply adjust the fill valve to match the water volume in your tank.

And, it’s as easy as that! 

Is It Possible To Clean A Toilet Fill Valve?

Toilet fill valves can become clogged with silt and debris over time. Fortunately, cleaning them is pretty straightforward.

Once you remove the fill valve’s cap, inspect it for any debris that may have become lodged inside and around the body of the fill valve.

Next, switch off the water supply and place a cup over the open fill valve.

This helps to force circulation of the water through the fill valve’s body.

Therefore, any debris or silt built up inside will start to become released.

To clean the valve fully, repeat this process two or more times. 

Is Every Toilet Fill Valve The Same?

No, toilet fill valves come in different shapes, sizes, and designs (as we stated above).

They all come with different rates of efficiency, depending on the manufacturer.

Nevertheless, most brands have something unique to offer consumers and, although some brands are more expensive, their efficiency may be the same as lower priced devices. 

Just make sure the toilet fill valve is compatible with your toilet before buying it.

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