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Fluidmaster

Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit

  • Based on 4,678 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Oct 23
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Size: Universal, for 2 In.


Features

  • Includes a PerforMAX fill valve and 2 in. flapper kit designed to restore the performance of toilets with a 2 in. flush valve by replacing worn or outdated components.

Description

Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit

Material: Plastic


Brand: Fluidmaster


Item dimensions L x W x H: 3.54 x 6.3 x 2.38 inches


Exterior Finish: Plastic


Inlet Connection Size: 2 inches


Inlet Connection Type: Female Iron Pipe


Outlet Connection Type: FNPT


Maximum Operating Pressure: 80 psi


Number of Ports: 2


Outlet Connection Size: 2 inches


Brand Name: Fluidmaster


Model Number: K-400H-039-T14


Number of Packs: 1


Global Trade Identification Number: 15


Unit Count: 1 Count


Item Highlight: Includes high-performance fill valve and adjustable 2 in. flapper, Helps fix running or slow-filling toilets


Manufacturer: Fluidmaster


Manufacturer Warranty Description: 7 Year Limited


Number of Items: 1


UPC: 039961031815


Included Components: PerforMAX Toilet Fill Valve, 2-Inch Flapper


Item Type Name: Toilet Repair Kit


Item Weight: 13.44 ounces


Number of Pieces: 2


Set Name: SET


Manufacturer Part Number: K-400H-039-T14


Exterior Finish: Plastic


Inlet Connection Type: Female Iron Pipe


Outlet Connection Type: FNPT


Maximum Operating Pressure: 80 psi


Number of Ports: 2


Thread Size: 2 inches


Thread Type: NPT


Connector Type: Female Iron Pipe, FNPT


Valve Type: PerforMAX Toilet Fill Valve


Item Dimensions: 3.54 x 6.3 x 2.38 inches


Inlet Connection Size: 2 inches


Outlet Connection Size: 2 inches


Size: Universal, for 2 In.


Material Type: Plastic


Specification Met: CSA, ULC


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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Similar Products

Top Amazon Reviews

    • Easy installation, good directions, well made parts; grateful I went through the process.
Number of Items: 1
It was my first time replacing a toilet valve, and thankfully the equipment and instructions made it straightforward for me. My apartment has an insanely small toilet (which managed to keep getting horrifically clogged with the mildest (ab?)use), and it was helpful with this installation to be able to adjust things like the amount of time the flapper stayed open to keep flushing, the tank fill height, and so forth. The noise level seems fine, the pieces had all fit perfectly despite the uniqueness of my toilet in size and shape (which makes most plungers worthless on it), and the quality of the pieces seems quite alright. I think the next modifications I make to the toilet (I may replace the gasket between tank and bowl) will come from this same brand, and I'm glad I had this decent of an experience learning to deal with toilet component replacements. ... show more
Reviewed in the United States on October 14, 2026 by William Bosch
    • Great product!
Number of Items: 1
Easy to install and worked great for fixing my running toilet. The fill valve adjusts easily, and the flapper has a good seal. Everything needed was included, and the toilet is working much better now. Good quality for the price.
Reviewed in the United States on September 1, 2026 by Kaban Family
    • Highly recommend..
Number of Items: 1
Easy to install, I like that it has a water pressure adjustment ( for example, I have high pressure in my home so it's really loud when filling the tank, but lowering the pressure makes it quieter) .. I was able to install this in 15 minutes
Reviewed in the United States on October 12, 2026 by CG
    • Toilet fill valve with stopper
Number of Items: 1
This was the second one I installed. The first was much easier to install. This one was more difficult because of tighter access. Overall works fine. The stopper floats and would not come down until I added a small weight on top to ensure it drops when intended.
Reviewed in the United States on October 5, 2026 by Russell young
    • INEXPENSIVE. EASY. WORKS.
Number of Items: 1
Worked like a champ. Easy to install and dial in without a youtube video even lol. Saw another reviewer mentioning the flapper didn’t fit because he bought a 3” and needed a 2” but didn’t know where to measure. Well, logic would dictate it being the hole it’s plugging, right? Perhaps? Just maybe? Just lift the flapper, eyeball the opening it was plugging. If it’s the size of an Oreo, you got a 2”. A baseball, you got a 3”. If your toilet was made after 2000, it could be a 3”. But before 2000, more than likely a 2”. If you’re uncertain, they make versions of this item without the flapper and you can purchase that part separately or as needed. As for measuring it? Use the ruler app on your phone to estimate without sticking a tape measure in your refill container. (Wink). That said, the flush is much stronger now, there were no leaking after install. The build quality seems fine, and these are inexpensive enough to not expect decades of use. My only complaint is the plastic or rubber tube to connect the water was a bit shorter than my previous one and interfered with the flush lever, so I had to use my previous one which was fine. I mentioned that specifically because some users described having to cut the included tube to make it shorter. In my case the reverse was true and mine was too short. Pause. All in all, a simple, inexpensive fix and I think I’ll replace the others in my house as well so they can race to see which lasts longest. Lol. 10/10 would recommend. ... show more
Reviewed in the United States on September 21, 2025 by Trips
    • EASY INSTALL & QUALITY JUST WOW!
Number of Items: 1
Well, I'm totally impressed & can't believe how easy it was to install! So our ancient floatie finally just quit on us the other day! Figured I was in for a part that would cost an arm & a leg! I mean it's plumbing you know! Well to my very pleasant surprise not only did we update our toilet, but it was less than $20! Sure I read reviews, researched and this is what hubby said this would fix it! So not only did I receive it in super fast delivery time, (practically next day)it actually WORKS! ONLY took around 15 mins to install and no flooding either lol! Directions were awesome and we are still getting used to how QUIET it is! I've flushed twice thinking I forgot nope I didn't hear it! We are very pleased with this update and realize how important everyone's experience is for others! Very easy to adjust, didn't take much it was almost perfect! The reasons I purchased this one, great reviews, sold ALOT OF them in past month, reputable brand! Easy peazy decision! Definitely worth every penny! Hope this helps someone to purchase this! It's amazing! Very highly recommended! ... show more
Reviewed in the United States on August 27, 2025 by Platinum DealZ
    • Great replacement
Number of Items: 1
Installed it and it was preset to the proper level for me. Fills quicker and is quieter than before. It was straight forward to instal. I have never messed with the toilet before and I didn't need the instructions or any videos and I figured it out. If you need to replace a old fill valve this one will do! ... show more
Reviewed in the United States on September 14, 2026 by codysmith_81
    • Highly Recommend
Number of Items: 1
Easy install, works well, I would buy this toilet fill valve again.
Reviewed in the United States on September 30, 2026 by Bill Parker

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