Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in
Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in
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Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in

4.6 stars out of 1352 reviews
(4.6)|
1,352 ratings

Key item features

  • Top Choice: The Fluidmaster K-400H-039 Repair Kit is the top choice to make your 2 in. flush valve toilet run like new.
  • Adjustable Water Levels: PerforMAX high performance toilet fill valve offers adjustable tank and bowl water levels for full water control.
  • Easy Installation: Fast and easy to install, designed to fit 2 in. flush valve toilets.
  • Height Adjustable: EZ-twist adjustable fill valve height to fit more tanks, ranging from 10 in. to 15 in.
  • Corrosion Resistant: Features a corrosion resistant flapper with a solid frame to eliminate twisting and leaks.
  • Water-Saving: Includes the PerforMAX Water-Saving Toilet Flapper with an adjustable dial to customize water use.
  • Durable Materials: Made with hard water resistant materials and built-in Microban technology to fight bacteria and breakdown.
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Customer ratings & reviews

4.6 out of 5 stars
stars1,352 ratings371 reviews
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Reviews summary

Pros
  • : Easy to follow with simple steps.
  • : Offers good value for the money.
  • : Fits toilet dimensions precisely and easily.
  • : Allows for height and shut-off adjustments.
Neutral
  • : Can be effective, but may have issues with leaks or slow flushing.
  • : Can be effective, but may not fit all models properly.
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Showing 1-3 of 371 reviews

Oct 26, 2025
Walmart customer
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

If I did it, you can fix your toilet too!!!!

I was worried to attempt to fix a toilet by myself, but tired of waiting on a man to do it for me, I ordered this it. I watched the YouTube video that the package directed me to, and followed the easy steps. Boom….my toilet flushes and it no longer runs endlessly. I am excited for the other toilets in my house to break so I can order this again. Five stars.

Helpful?442U91TTOHKL379610673
Feb 10, 2026
Finn
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

You can't go wrong

This kit is a lifesaver if you have a noisy or slow-filling toilet. It combines the Fluidmaster PerforMAX Fill Valve and 2" Flapper Kit, which is basically their "high-performance" line. The big win here is the adjustable water-saving dial, which lets you control how much water goes into the bowl with every flush. It's also built to be universal, meaning it should fit most standard 2-inch flush valve toilets. The installation is pretty straightforward, and many people find that it fixes common "phantom flushing" or leaking issues instantly. ​There are a few things to keep in mind for the install. On the plus side, the height is adjustable, so it fits well in both taller and shorter tanks. The flapper is also made of a chlorine-resistant material, which is great if you use those drop-in tank cleaner tablets that usually eat through rubber. However, some users have noted that the water-saving dial can be a bit finicky to tune just right at first. Also, while it's marketed as quiet, it might still have a noticeable "hiss" depending on your home's water pressure. Overall, it's a solid, heavy-duty upgrade over the basic valves you'd find in a standard hardware store.

Helpful?442U91TTOHKL379610673
Sep 9, 2025
Lifeafte
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

I have had this type of valve for many years which makes the installation of the working parts very simple. I just turned off the supply valve at the wall,drained the tank. Released the clamp on the old valve,slid it up and off and slid the new valve down on the stem, locked it in place with the ring and adjusted it to match the old one. Always replace the rubber flapper as it snaps in place and finish the job. I keep the stem and seal in case it might need to be replaced but so far it has been years since I put the first one in.

Helpful?442U91TTOHKL379610673