Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in price history and forecast - Fluidmaster K-400H-039-P4
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

Brand:
Fluidmaster
Model Number:
K-400H-039-P4
UPC:
039961031815
EAN:
0039961031815
ASIN:
B09NYLJ1FZ
Walmart SKU:
379610673
Key Takeaway

Price stability at $16.97 over two weeks indicates equilibrium, with current pricing closely tracking the 90-day average of $16.95.

Third-Party Seller Summary

Third-Party Seller Price History Summary
Price Type Price Date
Highest Price
$26.35
Lowest Price
$22.00
Most Recent Price
$22.85
Average Price
$23.74
First Tracked
Last Update

Walmart.com Summary

Walmart.com Price History Summary
Price Type Price Date
Highest Price
$16.98
Lowest Price
$15.98
Most Recent Price
$16.97
Average Price
$16.81
First Tracked
Last Update

Price Analysis

Tracking History: We have tracked Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in since 2/7/2025. The most recent price update was on Sep 4, 2026.

Price Range: Over the past 90 days, the price has ranged from $15.98 (lowest on 4/9/2025) to $16.98 (highest on 2/7/2025). The average price during this period is $16.81.

Current Trend: Walmart.com prices have ranged from $16.67 (Aug 11) to $16.97 (Sep 4) over the past 90 days. Current price is close to the 90-day average of $16.95.

Customer Insights: Rated 4.6/5 from 2164 reviews.

Customer Reviews

2164 reviews

Customer Reviews

4.6
Based on 2164 reviews
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Showing 10 of 2164 reviews

Easy for DIY'er

Jennifer February 13, 2026

Was having an issue in the toilet not flushing right. Googled some fix options. It was cheaper to buy this kit than the items separately. Plus I had other pieces left over in case needed next time I have issues. Fit was fine, pretty easy to install. I didn't even bug the hubby.

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An easy fix

Barbara February 7, 2026

I have never before done any toilet repair but with this replacement part, I was able to easily fix the “ ghost flush” that was waisting a LOT of water. The instructions were 100% easy to understand and follow. No tools needed and all the parts were included.

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perfect fit,works great

Mark February 4, 2026

It fixed the problem perfectly, the old stand valve was completely clogged with mineral sediment- I could have painstakenly repaired it but instead I just replaced it with the one I bought on line - also I did not use the flapper as mine was ok. I really only needed the stand valve, I just kept the flapper for a spare.

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

Anonymous October 25, 2025

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.

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Lifeafte September 8, 2025

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.

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Abigail June 25, 2026

The Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit is an excellent all-in-one solution for fixing common toilet issues. It had everything needed to restore my toilet to like-new performance, and the installation process was much easier than expected. The instructions were clear, and the adjustable fill valve made it simple to achieve the correct water level. After installation, the toilet filled quickly, flushed powerfully, and stopped the constant running that had been wasting water. The quality of the components is outstanding. The fill valve and flapper are made from durable materials that feel built to last, and everything fit perfectly without requiring additional parts. The adjustable height makes it compatible with a wide variety of toilets, which is a huge plus. I also appreciate how quiet the fill valve operates compared to my old one. It improved both the performance and efficiency of the toilet, making it well worth the purchase. Overall, the Fluidmaster K-400H-039 Repair Kit is reliable, easy to install, and offers excellent value. It's a great DIY repair that saves time and money while restoring your toilet's performance. Highly recommended and definitely deserving of a 5-star review!

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JUSTIN January 21, 2026

Fluidmaster is the Gold Standard for Toilet Tank fill Valves. So glad Walmart had this in stock. A friend of mine had moved into a new place and it needed a new one of these. I ordered it on Walmart com and picked it up from the store. Very Pleased it works wonderfully.

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Fluidmaster Repair Kit

Tman January 10, 2026

The Fluidmaster flapper repair kit worked well and stopped the leak immediately. The Instructions were clear and easy to follow, making installation quick even for a beginner. After installing, the toilet flush was smooth and consistent with no more running water. The flapper had a good fit change compared to the old one, sealing better and improving overall performance. Overall, a solid and affordable fix.

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Quick fix, no more running toilet- easy to install

John July 6, 2026

This kit made replacing my fill valve and flapper way easier than I expected. With a pair of pliers or a basic wrench, you can have this fully installed in under 10 minutes — no special tools needed, no headache. Since installing it, zero leaks or drips, and the constant running/refilling sound I used to deal with is completely gone. It just works quietly in the background like it should. For the price, this is a no-brainer over calling a plumber for something this simple. Solid quality, easy instructions, and it's held up great so far. Would buy again if I ever need to replace another one.

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Easy to install and set up

DirCat April 2, 2026

The toilet valve my landlord's maintenance guy installed... wasn't the best. I was leery of trying to install one myself, but I figured I'd give it a shot. This thing had great instructions, easy to install, and had three different adjustment areas to make the water come up just right. Heck, installation took under a half hour.

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Price History

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

Recent Price Changes

Detailed price history for the past 90 days

Walmart.com Pricing

60 records

Walmart.com prices have ranged from $16.67 (Aug 11) to $16.97 (Sep 4) over the past 90 days. Current price is close to the 90-day average of $16.95.

Walmart.com price history for Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in showing recent price changes over the past 90 days
Date Price Change % Change
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$16.97

Third-Party Seller Pricing

9 records

Third-Party Sellers prices have ranged from $22.85 (Aug 28) to $26.35 (Jun 25) over the past 90 days. Current price is close to the 90-day average of $23.24.

Third-party seller price history for Fluidmaster K-400H-039 PerforMAX Toilet Fill Valve and 2" Flapper Repair Kit, Plastic, 1-Pack, Height 13.9in showing recent price changes
Date Price Change % Change
$22.85 $+0.00 +0.0%
$22.85 $+0.00 +0.0%
$22.85 $+0.00 +0.0%
$22.85 $+0.00 +0.0%
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$22.85 $+0.00 +0.0%
$22.85 $-3.50 -13.3%
$26.35 $+3.50 +15.3%
$22.85

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