best toilet fill valve

Best Toilet Fill Valve Replacement Kit (2022 Review)

The toilet fill valve is one of the most important parts of your toilet. When you have issues with the toilet, the fill valve is often the culprit.

These valves wear down over time and need a replacement part. The good news is that you can often DIY the replacement without calling a plumber.

But what exactly is the best toilet fill valve? Here’s a quick list of good options available on Amazon:

  1. Fluidmaster 400AH PerforMAX (Our Top Pick)
  2. Vallvater Replacement Kit (Best High End)
  3. Korky 528MP QuietFILL Valve (Best Budget Pick)
  4. Fluidmaster 400CRP14 Repair Kit
  5. Kohler Valve Kit
  6. Fluidmaster PRO45

Types of Toilet Tank Fill Valve

A good buyer’s guide will teach you about the different types of toilet valves. Different fill valves may work for different toilet models.

In order to comply with plumbing standards, there need to be anti-siphon features in the valves as well.

Anti-siphon features keep low water pressure from mixing contaminated water with drinking water.

Plunger Valves

A plunger valve, otherwise known as a ballcock, is one of the simplest designs. These valves are crafted from brass and work quietly.

The water discharge tube fills from the bottom, while the hinged lever lets the float ball move.

These are silent fill valve options that typically regulate the amount of water allowed through the flush valve.

It should be noted, however, that if you have an older one of these models, it needs replacing. The older models do not have the anti-siphon technology necessary to protect your drinking water.

Diaphragm Valves

Diaphragm valves are very similar to plunger valves in that they also have a float ball. However, they tend to be made of plastic instead of brass.

There are a few older designs that use brass instead, but most of these are discontinued. Plastic is considered more desirable.

In addition, all of these diaphragm designs have anti-siphon technology. Rather than being sealed with a plunger and washer, they have a diaphragm that opens the flapper so water flows out of the toilet tank.

Float Cup Valves

Float cup valves have been around since the 1950s, but that’s relatively recent in terms of toilet technology.

These fill valves function without a ball float. Instead, there’s a cup-shaped like an O.

This is attached to the valve shaft. It slides up and down as the running toilet empties and fills.

You can control the water level with the adjustable height of the float cup. You just change where the cup connects to the metal rod.

Most fill valves that are sold today use this style. They’re an extremely popular choice to replace ballcocks in older toilets.

Floatless Valves

Floatless valves are the newest type of valve on the market. They were created for water-saving low-flow toilets.

These valves are popular because of how inexpensive they are, but they aren’t always reliable.

In fact, there are multiple plumbers who prefer not to use them at all. They tend to prioritize float cup valves instead.

Since floatless valves work underwater, they attach to the bottom of the toilet tank.

Now let’s take a look at the best fill valves on the market.

1. Fluidmaster 400AH PerforMAX Universal Repair Kit (Our Top Pick)

Fluidmaster 400AH PerforMAX

Our top pick overall is the PerforMAX from Fluidmaster. This repair kit has compatibility with any 2-inch flush valve.

Not only will it replace the fill valve, but it also replaces the flush valve, flapper, and toilet handle.

By replacing all of these components, you’ll take care of most of your toilet issues. The universal design can be integrated into high-performance toilets, toilets with standard water usage, one-piece toilets, and two-piece toilets.

You can adjust the valve anywhere from 10 to 15 inches depending on the size of your tank. This makes it compatible with multiple toilet brands.

Thanks to the solid frame, you don’t get any “ghost flushes” or twisting.

The entire kit can be installed in 10 minutes, making it one of the easiest to use on the market. The components all come with a 7-year warranty.


  • Universal toilet fill valve compatible with all brands
  • 7-year warranty
  • Replaces fill valve, flush valve, flapper, and handle


  • Only works with 2-inch valves

Buy The Fluidmaster 400AH PerforMAX Universal Repair Kit On Amazon

2. Vallvater Toilet Fill Valve Replacement Kit (Best High End)

Vallvater Replacement Kit

This replacement kit from Vallvater is compatible with Kohler toilets. While this is a somewhat pricier option, it is a complete kit that can replace or rebuild your current valves.

You can use the kit to replace leaking, worn down, or noisy valves. It’s also a good option if your gasket or valve has corrosion.

The design is completely silent, but it has double the refill rate of a standard design.

The kit comes with brass tubing and durable plastic pieces. It is designed for one-piece toilets.


  • Includes brass tubing and plastic parts
  • Compatible with various Kohler toilets
  • Double the refill rate of standard fill valves


  • Only built for Kohler toilets
  • Doesn’t work well on two-piece toilets

Buy The Vallvater Toilet Fill Valve Replacement Kit On Amazon

3. Korky 528MP QuietFILL Valve (Best Budget Pick)

Korky 528MP QuietFILL Valve

If you’re looking for a budget fill valve, you’ll appreciate this option from Korky. Made in the United States, it fits the majority of toilets thanks to the universal design.

The valve can replace standard ballcocks on both one-piece and two-piece toilets. You can easily install it by simply twisting and locking it into place.

It’s adjustable from 7.75 to 13.5 inches.

Installing the valve takes under five minutes. Included in the kit is the valve, refill tube, other inserts and accessories, and instructions.

Korky’s products are designed for compatibility with both modern and old toilet models. They craft their products from a combination of durable plastic and red rubber.


  • The universal model works with most toilets
  • Adjusts 7.75 to 13.5 inches
  • Durable pieces


  • Not a full toilet repair kit including a flapper or flush valve

Buy The Korky 528MP QuietFILL Valve On Amazon

4. Fluidmaster 400CRP14 Easy Installation Toilet Repair Kit

Fluidmaster 400CRP14 Repair Kit

This repair kit from Fluidmaster is built for easy installation. Crafted from a combination of rubber and plastic, it replaces your most inefficient valves.

It can replace the flush and fill valves, along with the flapper.

The universal design allows for adjustment between 9 and 14 inches. It is built to work with all 2-inch valve toilets.

Ideally, this valve is used with toilets that flush at least 1.6 gallons. It is not compatible with dual flush toilet systems.

This kit is resistant to corrosion thanks to the Microban material. The material also helps to prevent the growth of bacteria and hard water buildup.


  • Installs in under 10 minutes
  • Compatible with 2-inch flush valves
  • Special corrosion-resistant materials


  • Not the best for high-efficiency toilets
  • Not compatible with dual flush systems

Buy The Fluidmaster 400CRP14 Easy Installation Toilet Repair Kit On Amazon

5. Kohler Genuine Part Fill Valve Kit

Kohler Valve Kit

This fill valve kit is built for every Kohler Class Five toilet. It works silently to fill the tank and replace leaky, squeaky valves.

There are several fill rate inserts incorporated into the design, helping to improve performance.

You can adjust the valve to any tank height. Kohler does warn that you shouldn’t use any abrasive cloths to clean the materials.


  • Built for Kohler Class Five toilets
  • Silent, efficient valve design
  • Adjustable to any height


  • Incompatible with brands like American Standard, Danco, or Toto toilet designs

Buy The Kohler Genuine Part Fill Valve Kit On Amazon

6. Fluidmaster PRO45 Fill Valve

Fluidmaster PRO45

This option from Fluidmaster is compatible with the majority of standard toilets. It is designed with a specialized shank that minimizes noise.

Thanks to the anti-siphon technology, it is up to all code standards.

The fill valve is easy to install and can replace the majority of ballcocks. It is compatible with every brand.

When you make a purchase, there’s a 5-year warranty included.


  • 5-year warranty
  • Super quiet operation
  • Universal and fits all brands


  • It May not be the most efficient option

Buy The Fluidmaster PRO45 Fill Valve On Amazon

Final Thoughts

Your toilet fill valve is likely to wear down over time. It’s a good idea to replace it with one that will last a long time.

Some repair kits include a new fill valve, flush valve, flapper, and toilet handle. Others only come with the fill valve.

Make sure the valve you choose is compatible with your specific toilet model. Not every toilet valve is universal.