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The Five Best Toilet-Fill Valves–Reviews and How to Choose

Did you know that a leaking toilet could lavish as much as 750 liters of water daily? Multiply the numbers and you will be surprised at the amount of money going the drain per month. That is why you should expedite a toilet leak check and repair. Many toilet components could cause a leak, one of them being the fill valve. The best solution is either repair or replacement of the affected component. If you are here, you are likely looking for a replacement, so I will do my best to analyze the best toilet fill valves in the market. I also believe that the Buying Guide and Frequently Asked Questions (FAQ) sections will help in decision-making.

Here are our Five Best Toilet-Fill Valves with reviews

Best Overall– Fluidmaster 400CRP14 Universal Toilet Fill Valve and Flapper Repair Kit, for 2-Inch Flush Valve Toilets

Best for Environmental Friendliness – TOTO TSU99A.X Adjustable Replacement Fill Valve Assembly for Toilet Tanks

Best for Water Savings – Plumbcraft Adjustable Quick Shut Off Perfect Flush Anti-Siphon Toilet Fill Valve

Best for Durability – Kohler Genuine Part Gp1138930 Silent Fill Toilet Fill Valve Kit

Best for Refill Rate – Fluidmaster 400AH PerforMAX Universal High-Performance Toilet Fill Valve

Fluidmaster 400CRP14 Universal Toilet Fill Valve and Flapper Repair Kit, for 2-Inch Flush Valve Toilets – Best Overall

A combination of compatibility, ease of installation, and performance are qualities that every homeowner would want for their toilet. That, among other impressive things, is what this Fluidmaster toilet fill valve delivers.

The Fluidmaster 400CRP14 Universal Toilet Fill Valve has a universal design that fits most toilets in America. Some of the adjustable aspects of the product are the rate of water flow and the height. Considering the budget price, this is an exciting characteristic.

Regarding installation and use, two things make this item so easy to use: A simple design and availability of a Flapper Repair Kit. You can install the entire unit within ten minutes and the toilet will be as effective as brand new. It is the ideal replacement for a faulty fill valve and leaking flapper, as it comes with the 00A Fill Valve and the 501 Flapper.

You will also enjoy the product for long thanks to the durable plastic and metallic parts. Specifically, the dependable 501 2” flapper features a solid frame and corrosion-resistant materials, which can withstand even hard water.

In case the components are damaged or disappoint in any way, you can always fall back on the 5-year warranty provided by the manufacturer.

What I liked

  • Durable construction
  • Fixes several toilet issues- complete kit
  • Anti-siphon capability
  • Great product warranty

What I didn’t like

  • A bit of noise
  • Minor flapper problems

TOTO TSU99A.X Adjustable Replacement Fill Valve Assembly for Toilet Tanks – most environmentally-friendly

In an article titled “Eco-Friendly Houses: Green Future Ahead” in the 2014 Journal of Petroleum & Environmental Biotechnology, Kamaljeet K Sekhon Randhawa notes several sustainability benchmarks for an eco-friendly home that include energy generation, waste reduction, climate control and water conservation. The TOTO TSU99A.X Adjustable Replacement Fill Valve Assembly for Toilet Tanks is one of the best home implements towards that goal.

I think that one of the reasons this product is popular is the capability to fit all TOTO toilet tanks, thanks to its adjustable height. Its flow rate is also adjustable.

I also found this item extremely easy to install- the set had all the required accessories for installation. The set includes cone washer, nut, refill tube, refill clamp and the valve. If you ask me, even the most inexperienced user can connect these parts successfully.

Another selling point of this toilet fill valve is the Hydrotect component that mixes water and the dirt that may sediment at the bottom. I am yet to find a valve that is so effective in minimizing pollution of this nature. For this feature alone, I think you need to check out the product.

TOTO offers a one-year limited warranty for this valve.

What I liked

  • Reduced environmental pollution
  • Fits most toilet designs
  • Generates own hydropower

What I didn’t like

  • Relatively weak adjustment tube

Plumbcraft Adjustable Quick Shut Off Perfect Flush Anti-Siphon Toilet Fill Valve – Most water-efficient – Best for Water Savings

If like me you prefer brands that have been tested and proven for many years, then this product from Plumbcraft may be an excellent option, especially if you are looking for efficient performance in a quiet environment.

Easy to install and use, the fill valve features 8″ to 13″ adjustment range. It comes with a toilet repair kit, which contains a refill tube and flush valve. This valve will fit a wide variety of toilet models.

This item has a unique Anti-Siphon technology that keeps water safe. Included in the design are the Water Flow Adjustment Caps, which can help save 38% extra water for each flush.  The crowning thing is that even if the flush is powerful, the valve maintains a quiet fill. Its quick action water shut-off ensures that the toilet water does not run continuously.

My inspection and tests showed a sturdy item that should last a good number of years, but its all-plastic construction may call for careful handling. Otherwise, the limited warranty for one of the best toilet fill valves can come in handy.

What I liked

  • 38% water savings
  • Quiet
  • Durable
  • Ideal for two-piece models

What I didn’t like

  • Doesn’t fit dual flush models

Kohler Genuine Part Gp1138930 Silent Fill Toilet Fill Valve Kit – Best for durability

Most buyers know that Kohler produces some of the most reliable in the market. KOHLER engineers design their products with eyes on both durability and performance, so you can expect nothing less from the deceptively simple Gp1138930 Silent Fill Toilet Fill Valve Kit.

I will start with the super compatibility with class 5 toilets. The practical nature of this item is seen in the way it offers a variety of fill rates. I found the height adjustment feature particularly handy, as it suits many other brands.

Users tell of a valve that is easy to install and use. Remember that the adjustment can go to as far as 14 inches. You do not even need complicated tools to have this done-only your usual spanner and screwdriver.

Did I tell you that the Kohler Genuine Part Gp1138930 Silent Fill Toilet Fill Valve Kit could last for over two decades? Many reviewers have identified this as a great feature. Indeed, the goal of the engineers to promote the longevity of the original product has succeeded.

As you look for this Kohler item, remember to confirm shank color to determine correct part; if grey, use this part and if black, pick GP1083167. Cap color may vary. The 1-year limited warranty is good enough.

What I liked

  • Extremely durable
  • Highly versatile item

What I didn’t like

  • Relatively expensive

Fluidmaster 400AH PerforMAX Universal High Performance Toilet Fill Valve – Best for refill rate

Fluidmaster is one of the leading brands for toilet parts, so it does not come as a surprise to have a second product from them close this list of the best toilet fill valves in 2019. This time, it is the 400AH PerforMAX Toilet Fill Valve, whose refill rate has set a benchmark for the market.

I think the versatility of this item is one of the best today. Its height-adjustable valve shank design means that you can get heights from 10 to 15 inches. For your water consumption customizations, use the water-saving roller clamp. Compatibility with American Standard, TOTO, Kohler and other models is a huge plus.

A suggestion of the main selling point of this product is in the name “PerforMAX”. Using some of the best technologies, Fluidmaster developed the most powerful toilet fill valve on the market. It provides a refill rate that is 2 times what the competitors offer.

Experts and users cannot believe that this quality set is accompanied by a 7-year warranty! I promise you, you will search a lot before you find another offer as good as this one.

What I liked

  • Suits HET toilet models
  • Excellent water refill rate
  • Good adjustability

What I didn’t like

  • Considered non-compliant with Proposition 65- a California law regarding toxic substances

Buying Guide for the Best Toilet-Fill Valve

Basics of a Toilet Fill Valve

A toilet fill valve is simply a vertical valve that is attached to a hole inside the toilet tank. When you flush the toilet, water goes to the bowl, and at the same time, a special valve opens. Since the incoming water refills the tank, this valve is referred to as a toilet fill valve.

While older toilets had the famous arm with a float ball (Ballcock /Plunger type), modern toilet-fill valves are designed differently.  Two modern and popular valve types that come to mind are float cup and floatless type. The float cup type is characterized by a special cup that slides travels along the shank. For the floatless type, the central component is a pressure-sensing diaphragm.

Currently, the most popular toilet-fill valve brands are Fluidmaster and Korky, but several others are delivering quality products too. The beauty of having a wide range of options is that you can pick a product that suits your requirements. For instance, some users can only access hard water, so having a suitably designed valve such as this one from Fluidmaster® is necessary.

What are the reasons for a new toilet fill valve?

A toilet fill valve may last long, but it will eventually wear out due to constant use. The rate of wear will depend on the rate of flushing. In case you have the conventional ballcock type, you have an excellent opportunity to install the best toilet fill valve.

One of the signs that you need a new valve is the toilet running constantly. Since there are other pointers from this, it is best to do a thorough investigation before replacing the valve. If the float set and flapper chain are in good order, then you most likely need to find a better toilet fill valve.

A weak flush or an abnormally slow refill rate could also suggest a malfunctioning toilet fill valve. In some instances, the valve is not even broken, but it has blockages. Check for such issues before making the final decision to buy.

Finally, never ignore the noises that come from the toilet tank. Common noises are the high-pitched one- for metal components- and an initially low humming sound.  You most probably need a new toilet fill valve to take care of further damage. A plumber can always ascertain the matter so that you can make a confident move to replace it.

Factors for Choosing the Best Toilet Fill Valve

Since the market is awash with brands of toilet fill valves, it is understandable if you find it tricky to choose the best toilet fill valve. I think that focusing on these areas will help a lot:

  1. Installation Ease

If you wish to save on installation, select a model that is easy to install.

  1. Construction – internal parts

Metal may be durable, but it doesn’t suit a valve because of the corrosion aspect. Options such as plastic and rubber are ideal.

  1. Anti-Siphon Feature

Though not common in many valves, this feature is essential as it ensures that water flows in a singular direction. You need this if you want an assurance of clean water in the tank.

  1. Toilet Type

This factor is essentially about the compatibility of the valve. The best place to start is to determine the type of the malfunctioned valve. While most valves are now universal, it is worthwhile to confirm designs such as dual flush, single flush, two-piece and one-piece.

  1. Adjustability

Are you worried that you are unable to determine the ideal valve height? Adjustable models are there to take away that headache.

Frequently Asked Questions about Toilet-Fill Valve

Q1: What is the process of replacing an old toilet-fill valve with a modern one?

A: This process is simple, as you just need to remove the cistern cover, turn off the water supply and replace the valve using an adjustable wrench.

Q2: Can you interchange toilet-fill valves?

A: Yes, you can. Like the case of car tires, toilet fill valves are interchangeable. They may come in different colors and shapes, but overall, they all play the role of refilling the toilet tank.

Q3: How much does a toilet-fill valve cost?

A: Good toilet fill valves, for instance, Korky® or Fluidmaster®, costs up to $25 in most cases. However, you could pay slightly more or less depending on the intricacy of the item. These products are available in most local home improvement stores but if you are shopping online Amazon usually offers the best prices.

Q4: Can I repair the toilet-fill valve?

A: You can repair your toilet-fill valve, often without even needing the help of a plumber. Based on the problem, you can fix the component within an hour. However, it is advisable to seek a professional’s assistance in case you are uncertain about the approach.


There is no harm in repairing the toilet, but some issues call for replacement. If you think that your toilet fill valve is beyond repair, there are plenty of options in the market. While DIY valve replacement is possible, some instances require expert hands. The top 5 toilet-fill valves that I have covered here may appear somewhat similar, but a closer check reveals unique features and capabilities. The gist of it all is that you should not ignore this part of the toilet. I hope that my reviews and the accompanying buying guide have been helpful in telling the difference and picking the best toilet fill valve based on durability, compatibility, refill speed, noise, and other factors. So, improve the performance of your toilet with any of these products!