---
product_id: 433282442
title: "Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit"
brand: "fluidmaster"
price: "¥8703"
currency: JPY
in_stock: true
reviews_count: 13
category: "Fluidmaster"
url: https://www.desertcart.jp/products/433282442-fluidmaster-k-400h-039-toilet-fill-valve-and-2-inch
store_origin: JP
region: Japan
---

# 2-inch adjustable flapper for leak-free flush PerforMAX fill valve for precision flow 7-year limited warranty for lasting reliability Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit

**Brand:** fluidmaster
**Price:** ¥8703
**Availability:** ✅ In Stock

## Summary

> 🚽 Upgrade your throne with leak-proof precision!

## Quick Answers

- **What is this?** Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit by fluidmaster
- **How much does it cost?** ¥8703 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/433282442-fluidmaster-k-400h-039-toilet-fill-valve-and-2-inch)

## Best For

- fluidmaster enthusiasts

## Why This Product

- Trusted fluidmaster brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy DIY Upgrade:** Simple installation replaces worn parts to restore toilet efficiency in minutes
- • **Trusted & Top-Ranked:** Ranked #2 in Toilet Flappers with 4.6-star rating from 4,457+ satisfied pros
- • **Durability Meets Design:** High-grade plastic construction resists wear and corrosion for long-term performance
- • **Universal 2-Inch Flapper:** Adjustable fit ensures a perfect seal, eliminating leaks and saving water
- • **Precision PerforMAX Valve:** Engineered for consistent, quiet water refill with max 80 psi pressure tolerance

## Overview

The Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit combines the advanced PerforMAX fill valve and an adjustable 2-inch flapper to restore and enhance toilet performance. Designed for universal 2-inch flush valves, it offers durable plastic construction, easy installation, and a 7-year limited warranty. Highly rated and trusted by professionals, this kit ensures efficient, leak-free flushing and water savings.

## Description

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

Review: Great product! - 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.
Review: EASY 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!

## 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09NYLJ1FZ |
| Best Sellers Rank | #471 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Toilet Flappers |
| Brand | Fluidmaster |
| Brand Name | Fluidmaster |
| Connector Type | Female Iron Pipe, FNPT |
| Customer Reviews | 4.6 out of 5 stars 4,687 Reviews |
| Exterior Finish | Plastic |
| Global Trade Identification Number | 00039961031815 |
| Included Components | PerforMAX Toilet Fill Valve, 2-Inch Flapper |
| Inlet Connection Size | 2 inches |
| Inlet Connection Type | Female Iron Pipe |
| Item Dimensions | 3.54 x 6.3 x 2.38 inches |
| Item Highlight | Includes high-performance fill valve and adjustable 2 in. flapper, Helps fix running or slow-filling toilets |
| Item Type Name | Toilet Repair Kit |
| Item Weight | 13.44 ounces |
| Item dimensions L x W x H | 3.54 x 6.3 x 2.38 inches |
| Manufacturer | Fluidmaster |
| Manufacturer Part Number | K-400H-039-T14 |
| Manufacturer Warranty Description | 7 Year Limited |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Operating Pressure | 80 psi |
| Model Number | K-400H-039-T14 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 2 |
| Number of Ports | 2 |
| Outlet Connection Size | 2 inches |
| Outlet Connection Type | FNPT |
| Set Name | SET |
| Size | Universal, for 2 In. |
| Specification Met | CSA, ULC |
| Thread Size | 2 inches |
| Thread Type | NPT |
| UPC | 039961031815 |
| Unit Count | 1 Count |
| Valve Type | PerforMAX Toilet Fill Valve |

## Product Details

- **Brand:** Fluidmaster
- **Exterior Finish:** Plastic
- **Inlet Connection Size:** 2 inches
- **Inlet Connection Type:** Female Iron Pipe
- **Item dimensions L x W x H:** 3.54 x 6.3 x 2.38 inches
- **Material:** Plastic
- **Maximum Operating Pressure:** 80 psi
- **Number of Ports:** 2
- **Outlet Connection Size:** 2 inches
- **Outlet Connection Type:** FNPT

## Images

![Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit - Image 1](https://m.media-amazon.com/images/I/71FddZ8DTML.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Questions & Answers

**Q: will this replace a 400A on an american standard 4392?**
A: Yes this will replace the 400A and flapper that is in that model of tank. For more information please contact Fluidmaster’s Technical Service Department, 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.

**Q: My new one leaks a little when you flush. Under the blue cap just a few drops than it stops leaking. Is this a normal release of water when flushed ?**
A: I would have been thrilled if mine had only leaked a few drops.  Mine sprayed water like a fire hose so I returned it.

**Q: Will this fit a Kohler 1.6 gallon toilet?**
A: I see no reason why not, unless your tank is too low to put the tank lid or cover back on. check height of fill valve and tank depth

**Q: Does this work with the toilets that does not have handles.. we have the one where you have to push the button in the center top of the tank.. Thanks**
A: The part you are buying is the tube that refills the tank after the flush has occurred.  Whether the flush is because of a handle or a button on the top of the tank. this unit is is separate from that action.  The flapper valve included may or may not work with your tank but the unit itself to fill the tank over and over will work just fine.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product!
*by K***Y on September 1, 2026*

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.

### ⭐⭐⭐⭐⭐ EASY INSTALL & QUALITY JUST WOW!
*by P***Z on August 27, 2025*

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!

### ⭐⭐⭐⭐⭐ INEXPENSIVE. EASY. WORKS.
*by T***S on September 21, 2025*

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.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-28*