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Internet # 100554467

Model # 400ARP25

Store SKU # 147966

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400A Universal Toilet Fill Valve

$9.98
  • A Fluidmaster 400A fill valve replacement
  • Universal design fit’s most toilet models and is easy to install
  • The trusted, and proven Fluidmaster toilet fill valve
  • View More Details

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Return this item within 90 days of purchase.

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Product Details

About This Product

The Fluidmaster 400A Universal Toilet Fill Valve is the #1 selling toilet fill valve in the world. A height adjustable toilet replacement part designed to fix leaking, noisy and slow filling toilet valves, in an easy to install model. The anti-siphon design eliminates fresh water supply contamination, is code approved and efficiently uses water. The 400A is a trusted and durable toilet replacement part, consisting of corrosion-resistant materials combined with simple installation. Fluidmaster is the trusted brand for replacement fill valves and all your toilet parts needs. Parts included with 400A purchase are Fill Valve, Shank Washer, Locknut, Refill Tube, Refill Clip and Instructions. Upgrade your toilets fill performance with this proven toilet tank fill valve. The Fluidmaster 400A is a quick and easy replacement toilet fill valve that solves common toilet problems.

Highlights

  • Consumers top choice to fix noisy toilets
  • Easy to install
  • New easier to turn tank water level adjustment dial
  • Now pre-installed shank washer for quicker installation
  • Quickly replaces old or inefficient fill valves
  • 5 year warranty
  • Best-selling toilet fill valve in worldwide
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 100554467

Model # 400ARP25

Store SKU # 147966

Specifications

Dimensions: H 12.6 in, W 3 in, D 3 in

Dimensions

Product Depth (in.)

3 in

Product Height (in.)

12.6 in

Product Width (in.)

3 in

Details

Adjustable Fit

Shank will adjust from 9" to 14"

Color/Finish Family

Black

Features

No Additional Features

Included

Hardware Included

Material

Plastic

Pack Size

1

Plumbing Part Type

Toilet Fill Valve

Returnable

90-Day

Style

Classic

Valve Type

Fill

Warranty / Certifications

Manufacturer Warranty

5 year

Questions & Answers

I have a Kohler, Cimmaron Toilet, Tank number K-4634-BA. Will this Fluidmaster Valve work?
ByMay 27, 2026
1 Answer | 
Answer This Question

Yes it will, For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

By|May 29, 2026


    will the fluidmaster kit fit an american standard model number 4021N
    ByMay 26, 2026
    1 Answer | 
    Answer This Question

    Yes it will. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

    By|May 26, 2026


      Is this correct replacement for My current fill valve number is M21611
      ByMay 8, 2026
      1 Answer | 
      Answer This Question

      The number you provided is not a model number for our product but if you got that number from the colored cap at the top of then it's a manufacturing date. Our 400a would replace that valve. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

      By|May 12, 2026


        How do i adjust the bade
        ByMay 7, 2026
        1 Answer | 
        Answer This Question

        For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

        By|May 9, 2026


          will this work on a 4in flush valve toilet
          ByApr 30, 2026
          1 Answer | 
          Answer This Question

          Based on the limited information we are not able to confirm whether this product will work with your specific model of toilet. More information is required. y spread so thin that the sealing bead around the floor flange will break during normal use or plunging. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011

          By|May 1, 2026


            will this work on american standard tank 4215a
            ByApr 30, 2026
            2 Answers | 
            Answer This Question

            Yes it will. y spread so thin that the sealing bead around the floor flange will break during normal use or plunging. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011

            By|May 1, 2026

              This fluid master fill valve will work fine in your toilet.

              By|May 1, 2026


              This part Fit for KOHLER M24318?
              ByMar 23, 2026
              1 Answer | 
              Answer This Question

              That is not a Kohler model number. If this number was obtained from the colored cap of the current fill valve it's a manufacturing date. It's a Fluidmaster product. You can use any 400 series fill valve to replace that current one including the 400a as they are interchangeable. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

              By|Mar 25, 2026


                Will this work on a kohler toilet
                ByMar 20, 2026
                1 Answer | 
                Answer This Question

                Based on the limited information provided we are unable to determine whether this fill valve will work with your specific Kohler toilet. More information is required. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

                By|Mar 24, 2026


                  Viewing 1-8 of 240

                  Customer Reviews

                  4.7 out of 5

                  • 4.7 out of 12,755 reviews
                  • 91% recommend this product
                  Filter by:
                  Showing 1-10 of 12,755 reviews
                  The nut hits the toilet outside underneath It could not be turned
                  by
                  Response from FluidmasterSupportMay 11, 2026
                  If the original nut is not damaged you can reuse it as it seems you may have a toilet fill valve hole too close to the bowl. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011. FluidMaster
                  • Verified Purchase
                  Great product! Universal on most toilet tanks! Very easy to install! Comes with everything you need in the box !!
                  by
                  Works great - easy to install and adjust. I'm flushed with success in fixing toilet!
                  by
                  • Verified Purchase
                  Fixed my running Kohler toilet.
                  I used this kit to repair my Kohler fill valve. I just needed the fill valve cap/seal. This whole kit was just slightly more expensive and I figured if there was an issue I could use the whole kit to replace the whole assembly. Luckily, all I changed over was the cap and included seal and it stopped my running toilet! Great fix, very satisfying it worked. I looked around at the installed original Kohler fill valve assembly and parts of it were actually branded fluid master! Great buy I think. Will keep rest of kit for spares.
                  by
                    • Recommended
                    Get ready to replace it again in a couple years
                    If you buy this, it is easy to install and then a couple years later you will probably need to replace it. When you buy it, purchase a plastic box, put all the necessary tools in the box and perhaps buy two sets of valves avoid a trip to the store 2 years from now and make the next replacement faster. Or you could buy a Toto or other quality valve and maybe wait 10 years instead. Sick and tired of these fluidmaster valves needing constant replacement.
                    by
                    Response from FluidmasterSupportJul 14, 2025
                    There are many reasons as to why a fill valve would start to have issues. Some of these issues can be resolved by performing maintenance as there will be outside sediment or debris that will hinder the performance of the valve. This is not limited to just Fluidmaster parts as this happens with any brand. Our product does have the option to perform maintenance to help the product keep performing. Now if the maintenance doesn't help the product does qualify for a warranty replacement under the 5 or 7 year policy depending on the model of the fill valve. You can submit the claim to our waranty department and once information and issue is validated a replacement will be shipped out. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011. FluidMaster
                      3 found this review helpful
                      Fluidmaster 400A Universal Is working great after installing, I’d rate with 5 bc its good price for less than $10.0 and not needed adjustment.
                      by
                      • Verified Purchase
                      Very disappointed with Fluidmaster
                      This fill valve came with a Kohler toilet that I purchased 11/23. Seventeen months later, in 4/25, I noticed that the fill valve paused for 15-60 seconds, when refiling the bowl. It would partially fill, then pause, then start up again. I Googled the problem, which others have reported. I flushed the fill valve twice, thinking there might be an obstruction. A slight tap at the cap would get the valve going. I contacted Fluidmaster. They said to wash the small parts, including a rubber washer and a small metal pin, in warm soapy water. This had no effect. They then advised me to buy a newer model, since this one is five months over the one year warranty period. I am very disappointed with the company and I will be replacing the Fluidmaster fill valve with a fully functioning Korky that I took out of the old toilet.
                      by
                      Response from FluidmasterSupportApr 21, 2025
                      In situations where the fill valve is having issues refilling and there's no debris, the seal underneath the cap would be the main reason for it. We advise to clean the seal and to soften it up as that's the main component of the valve that opens and closes the valve. A warranty is in place through the manufacturer that installed it in their toilet. In this case you would have to contact Kohler as they are offering the warranty as a package deal with their toilet. Fluidmaster has a different process for products purchased off the shelf and not a factory installed item. 1 year is how long we cover some items when it's factory installed in other companies toilets. There are some exceptions that will be made. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011. FluidMaster
                        2 found this review helpful
                        The fill valve was easy to install, great quality and price is right. Recommended a 100%
                        by
                        • Verified Purchase
                        Could Not Stop The Leak
                        I installed the Fluidmaster 400A to replace a previous 400A the was no longer working correctly. This new model immediately started to leak from just under the top valve after the water level rose to turn it off. In the picture you can see a stream of water coming out from just under the valve. Very disappointed. These used to be good.
                        by
                        Response from FluidmasterSupportJan 27, 2025
                        In situations where the cap leaks you may want to flush out the valve as stated in our installation guide troubleshoot section. A leaky cap could be due to dirt and debris that comes from your pipes and when you turn the water back on it can sometimes shake the pipes knocking debris loose running into the valve. Flushing it out may help with that issue. If there is no debris then allowing the rubber seal to break in with a few days of usage can resolve that matter for you. There will be occasions where product may sit for a long period of time or be stored in a bad location from the retailer you purchased it from causing the seal to stiffen up a little bit. It just needs to be softened up and the leaky cap is just a pressure release so the cap doesn't blow off. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011. FluidMaster
                          4 found this review helpful
                          The Fluidmaster 400A seems to be very universal and adjusted to fit my toilet which is a low profile, silent flush Kohler model. It was easy to adjust and had a very supple gasket which made leak-proof installation a snap.
                          by
                          • Verified Purchase
                          Showing 1-10 of 12,755 reviews

                          Compare Key Features

                          current item

                          Product Snapshot

                          Ideal for fixing noisy or leaky toilets with easy installation and a 5-year warranty. Best-selling, reliable performance.
                          Ideal for water-conscious homeowners, this fill valve detects leaks, adjusts water levels, and cleans with every flush.
                          Ideal for upgrades with quiet, powerful flushes, easy install, and water saving features. 7-year warranty included.
                          Ideal for homeowners looking for a durable brass shank fill valve, making toilet repair easy and efficient.

                          Adjustable Height

                          Anti-Siphon Protection

                          Water Flow Rate

                          Refills quickly
                          2X greater bowl refill

                          Water Efficiency

                          Water-saving with adjustable refill level
                          Adjustable tank and bowl water levels
                          Water saving adjustable dial

                          Material Quality

                          Corrosion-resistant materials
                          Acrylonitrile Butadiene Styrene (ABS)
                          Plastic
                          Heavy-duty brass shank