fluidmaster vs korky fill valve

Fluidmaster vs Korky fill valve: A Comparative Analysis of Fill Valves

Last Updated on July 2, 2023

Tired of literally ‘wasting’ time and money on a toilet constantly fighting against you? Get smarter about your bathroom decisions with the right fill valve, helping make those leaky woes disappear.

When it comes to choosing the best brand, we’ll compare two of the top contenders: Fluidmaster and Korky.

Fluidmaster will make your toilet upgrade a breeze. Featuring an adjustable water level and self-adjusting design to prevent leaks, their fill valve offers installation convenience and superior performance with its large refill tube.

Korky’s fill valve combines flexibility, ease of installation and universal design to make it an ideal choice for your toilet. With a patented solution that reduces noise and stops leaks in their tracks, you can rest assured knowing Korky has got your back.

This blog details two top brands and examines cost, durability, installation simplicity and performance. Whether it’s a quick fix at home or selecting quality products for professional clients, we’re here with reliable info.

Korky 528 Toilet Fill Valve, Universal, Black(Packaging May Vary)
  • UNIVERSAL FILL VALVE: This toilet fill valve replaces ballcocks & worn down valves for different…
  • EASY TO INSTALL: Quiet replacement fill valve has a twist-lock adjustment that makes installation…
  • INCLUDES: Installs in less than 5 minutes. Includes fill valve, refill tube, metal refill tube clip,…
Fluidmaster 400A Anti-Siphon Universal Toilet Tank Fill Valve,Black
  • fluidmaster400a anti-siphon toilet fill valve – fm400a
  • This is highly durable
  • This is manufactured in MEXICO

Features and Benefits

Fluidmaster and Korky are two well-known brands in the plumbing industry that offer fill valves for toilets.

Fluidmaster’s fill valve features an adjustable water level, easy installation, and compatibility with most toilets. It also has a large refill tube for better water flow and a self-adjusting design that helps prevent leaks.

Korky’s fill valve, on the other hand, has a patented design that helps reduce noise and prevent leaks. It is also made with a flexible material that allows for easy installation and has a universal design that works with most toilets.

Fluidmaster fill valve

In terms of benefits, a high-quality fill valve can help improve the performance and efficiency of a toilet. By ensuring that the right amount of water is in the tank, fill valves can prevent leaks and save water in the long run. Furthermore, a quiet and reliable fill valve can contribute to a more comfortable and peaceful bathroom experience.

When choosing between Fluidmaster and Korky, it is important to take into account the individual’s requirements and tastes. It’s also crucial to ensure compatibility with the toilet. Both brands are known for their top-notch fill valves that can deliver dependable performance over an extended period.


When it comes to installing a fill valve, both Fluidmaster and Korky offer simple and straightforward options.

Fluid master’s fill valves are designed with a universal fit, making them compatible with most toilets. They also feature an easy-to-follow design that allows for quick and hassle-free installation. The fill valve can be adjusted to the desired water level, making getting the right amount of water in the tank simple.

Korky’s fill valves are also designed with ease of installation in mind. They are constructed with a flexible material that enables simple adjustment to accommodate most toilets. It also provides clear and concise instructions for installation, making it simple for even those with limited plumbing experience to install the valve.

In terms of tools and equipment needed, both Fluidmaster and Korky fill valves require only a few basic tools, such as a screwdriver and pliers, to get the job done.

Adjustable water level

The adjustability of the water level through fill valves is crucial as it ensures the appropriate amount of water is present in the toilet tank. This helps to prevent leaks and improve the efficiency of the toilet. Both Fluidmaster and Korky offer fill valves with adjustable water levels.

Fluid master’s fill valves have a self-adjusting design that allows for easy customization of the water level. The water level can be adjusted by turning the valve stem accessible from the top of the tank. This makes getting the desired water level simple, even for those with limited plumbing experience.

Korky’s fill valves also allow for easy adjustment of the water level. Their flexible design enables users to adjust the valve as needed to achieve the desired water level. The level of water can be regulated by rotating the valve stem, which can be reached from the top of the tank.

In terms of precision and ease of use, both Fluidmaster and Korky offer fill valves that make it simple to get the right water level in the toilet tank.

When deciding between the two options, it is crucial to consider the consumer’s individual requirements and preferences. Both brands have a reputation for delivering fill valves with reliable performance and efficient water use.

Durable and long-lasting

Both Fluidmaster and Korky are well-known brands in the market for toilet fill valves, which are crucial components of a toilet system. They offer durable and long-lasting options to ensure your toilet operates smoothly and effectively.

Fluidmaster is known for its robust design and construction, with fill valves made of high-quality materials that are built to last.

 Korky fill valve

Their models, such as the 400A and the 500A, are made of a sturdy plastic material that is resistant to corrosion and wear and tear. This helps ensure that the fill valve will function properly for an extended period, even with heavy use.

Similarly, Korky also offers a range of durable fill valves, with models like the Korky QuietFill and the Korky Universal. These are constructed with a durable plastic material that can withstand tough water conditions and frequent usage.


Regarding cost, both Fluidmaster and Korky offer a range of fill valve options at different price points.

Fluidmaster fill valves are generally more affordable, with prices starting from as low as $8 to $15 for their basic models.

They also offer more advanced options with additional features, such as adjustable water levels, which come at slightly higher prices, typically around $20 to $30. Fluidmaster is a cost-effective option for those looking for a reliable fill valve at a reasonable price.

Korky fill valves are typically more expensive than Fluidmaster, starting from approximately $15 to $30 for their standard models. However, for those looking for advanced models with added features such as adjustable water levels, prices can go up to around $40.

Despite their higher cost, Korky fill valves are known for their long-lasting durability and dependability, making them a valuable investment in the long term.

Fill Valve Pros And Cons for Fluidmaster And Korky



Affordable: Fluidmaster fill valves are generally more budget-friendly, making them a good choice for those who are looking for a reliable option at a reasonable price.

Durable: Fluidmaster’s reputation for producing durable and long-lasting fill valves makes them a wise investment for the future.

Easy to install: Fluidmaster fill valves come with detailed instructions and are straightforward to install, even for those without plumbing experience.


Noisy: Fluidmaster fill valves are known for being a bit noisier than other brands, which could be a concern for those sensitive to noise levels in their bathroom.

Bulky design: Fluidmaster fill valves have a larger, bulkier design than other brands, making them more difficult to install in tight spaces.



Quiet operation: Korky fill valves are favored for their silent operation, making them ideal for individuals who want a peaceful bathroom environment.

Sleek design: Korky fill valves have a compact, sleek design that reduces the risk of leaks and makes them easy to install in tight spaces.

Adjustable: Korky fill valves are user-friendly and easy to adjust, allowing you to set the water level to your preferred height.


Higher cost: Korky fill valves tend to be more expensive than other brands, making them a less cost-effective option.

Challenging to replace: Korky fill valves may pose a difficulty for replacement compared to other brands, making them a concern for individuals who lack plumbing expertise.

What is the most common problem associated with the Fluidmaster?

The most common problem associated with the Fluidmaster, a toilet flushing system, is a weak flush caused by damaged flush valves or air filters on the fill valve. 

Other problems include phantom flushes caused by problems with the flapper ball or flapper. No other specific problems with the Fluidmaster are mentioned in the provided search results.

Which Fluidmaster do I need?

Fluidmaster is a company that provides toilet repair kits and flushing systems. If you want to repair a leaky toilet, you can consider the Fluidmaster 400CRP14, a toolless toilet repair kit that includes a 400A Fill Valve and a 501 Flapper. 

Another option is the Fluidmaster 400ARHR KP10 Premium Toilet Repair Kit, which can replace inefficient fill and flush valves, leaky flappers, and broken toilet handles. If you need a long-lasting toilet flapper, you can consider the Fluidmaster 502P21 PerforMAX Universal Water-Saving Long-Life Toilet Flapper.

In case you are looking for a universal gasket to fit your drain lines and toilet, you can consider the Fluidmaster with a 10-year warranty, which is considered a universal gasket to fit 3 or 4 inches of drain lines and any toilet and allows repositioning during installation.

How do you adjust a Korky fill valve?

The Korky fill valve is a universal fill valve designed to replace all TOTO fill valves and is adjustable for water height in the tank. The twist-lock adjustment makes installation easy and the valve is designed to fit more toilets. 

The valve is also equipped with QuietFILL technology, which makes it quieter than other fill valves. To adjust the valve, turn the adjustment screw located on the side of the valve clockwise to increase the water level and counterclockwise to decrease the water level. The water level should be below the top of the tank’s overflow tube.

Why is my new Korky fill valve hissing?

A few different things can cause a hissing sound from a new Korky fill valve. One common cause is water pressure that is too high. If the water pressure is too high, it can cause the valve to leak, leading to a hissing sound. Another possible cause is a faulty washer or seals within the valve. 

Finally, the valve may not be installed properly, which can also lead to a hissing sound. To resolve the issue, check the water pressure and make sure it is within the recommended range for the Korky fill valve.

If the water pressure is within range, inspect the valve for any signs of damage or defects and make sure it is properly installed.

Toilet Troubles Solved: A Verdict on Fluidmaster vs. Korky Fill Valve

When it comes to deciding between a Fluidmaster and a Korky fill valve, it can be tricky as they both offer their own distinct advantages.

If you’re looking for something quick and simple to install, then Fluidmaster is ideal for you. Its adjustable design fits most toilets very easily.

Alternatively, if you want something that runs so quietly you won’t even notice it’s on, plus a longer lifespan than average, then Korky offers what you seek.

In the end, the choice is yours. Both options have their pros and cons, so go with whichever suits your needs best.

Korky 528MP QuietFILL Platinum Fill Valve-Fits Most Toilets-Easy to Install-Made in USA, Universal 99%, Black
  • UNIVERSAL FILL VALVE: This toilet fill valve replaces ballcocks & worn down valves for different…
  • EASY TO INSTALL: Quiet replacement fill valve has a twist-lock adjustment that makes installation…
  • INCLUDES: Installs in less than 5 minutes. Includes fill valve, refill tube, metal refill tube clip,…
Fluidmaster 400H-002 Performax Universal Toilet Fill Valve High Performance Tank and Bowl Water Control, 1-Pack, Multicolor
  • Fix noisy, or slow filling fill valves with the quietest, most powerful toilet fill valve available
  • Easy to install, step-by-step instructions included
  • Universal fit for most toilet models and brands

Last update on 2023-12-05 / Affiliate links / Images from Amazon Product Advertising API

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top