Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit
4.6 | 3,580 ratings
Price: 16.97
Last update: 01-21-2026
About this item
- The PerforMAX fill valve and 2 in. Flapper Kit is the premium solution to make your 2 in. flush valve toilet run like new
- PerforMAX toilet fill valve offers high performance with adjustable tank and bowl water for full water control
- Fast and Easy to Install
- PerforMAX Water-Saving Toilet Flapper included to save water use per flush
- Adjustable fill valve height to fit more tanks, corrosion resistant flapper, Solid frame for a secure seal, 7 year warranty
Product information
Features & Specs
| Exterior Finish | Plastic |
|---|---|
| Inlet Connection Type | Female Iron Pipe |
| Outlet Connection Type | FNPT |
| Maximum Pressure | 80 Pound per Square Inch |
| Number of Ports | 2 |
| Valve Type | PerforMAX Toilet Fill Valve |
Measurements
| Item Dimensions | 3.54 x 6.3 x 2.38 inches |
|---|---|
| Inlet Connection Size | 2 Inches |
| Outlet Connection Size | 2 Inches |
User guide
| Specification Met | CSA, ULC |
|---|
Additional details
| Material Type | Plastic |
|---|
Warranty & Support
Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee:You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditionshere.
Manufacturer’s warranty can be requested from customer service.Click hereto make a request to customer service.
Feedback
Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit
Share:https://www.amazon.com/dp/B09NYLJ1FZ
Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.
Where did you see a lower price?
Fields with an asterisk*are required
Pleasesign into provide feedback.
Item details
| Brand Name | Fluidmaster |
|---|---|
| Model Number | K-400H-039-T14 |
| Global Trade Identification Number | 00039961031815 |
| Manufacturer | Fluidmaster |
| UPC | 039961031815 |
| Customer Reviews | 4.64.6 out of 5 stars(3,291) 4.6 out of 5 stars |
| Best Sellers Rank |
|
| ASIN | B09NYLJ1FZ |
| Item Type Name | Toilet Repair Kit |
| Included Components | PerforMAX Toilet Fill Valve, 2-Inch Flapper |
| Item Height | 2.38 inches |
| Item Weight | 13.6 Ounces |
| Unit Count | 1.0 Count |
| Manufacturer Warranty Description | 7 Year Limited |
Top reviews from the United States
- Chelsea NGreat Fix for a Running ToiletThis kit had everything I needed to repair my toilet. The instructions were clear, installation was straightforward, and the adjustable flapper made it easy to get the right flush. The fill valve is quiet and works smoothly—no more constant running or wasted water. A solid, affordable solution that saves on plumber costs.
I bought two of these, so you can tell how much these work! - John Q. PublicGreat choice, solid manufacturingHave purchased many Fluidmaster toilet kits and they always have performed well and this model is no exception. Easy to install and adjust with detailed instructions provided. No leaks, seals well and solves the running problem.
- TripsINEXPENSIVE. EASY. WORKS.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. - A. PersonEasy fix. Adjustable valve does leak a littleI've had a toilet in the guest bathroom that has had issues with the old fill valve since I moved in 5 years ago and I finally got around to realizing what a cheap and easy fix it was to just put a new valve in myself. I also changed my old rigid supply line to a braided line, got this installed and adjusted easily. Only complaint is the little dial that controls the bowl water tube drips a little when refilling, and at certain adjustment levels it sprays tiny stream of water up out of the top of it, thought I do appreciate the ability to adjust it I'm not sure if it's supposed to leak at that valve or not, though it luckily doesn't cause an issue.
- KBEasy install and great productWow, this was the easiest and fastest DIY toilet plumbing job I’ve ever done. This product is fantastic, with easy to follow instructions and a product that works immediately.
- Robert SkindellPerfect replacementWe bought this because we needed to replace the fill valve and flapper in our toilet. Works perfectly and is easy to install. My daughter wanted to try to replace it when it came. I got her the tools she needed and let her try it on her own, without my help. I was very surprised that she quickly replaced it without any problems. She just used the instructions, and in no time, the job was done.
- Wayne JWorks Great with Positive Shut-OffWorked like a champ. It seems to be just a bit slower refilling than the one I replaced. However, the level adjustment is easy, and the shut-off is positive. This is a very easy installation.
- JPEASY INSTALL & QUALITY JUST WOW!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!