---
product_id: 433282442
title: "Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit"
brand: "fluidmaster"
price: "€ 45.94"
currency: EUR
in_stock: true
reviews_count: 13
category: "Fluidmaster"
url: https://www.desertcart.sk/products/433282442-fluidmaster-k-400h-039-high-performance-toilet-fill-valve-2
store_origin: SK
region: Slovakia
---

# high performance fill valve easy DIY installation 2-inch adjustable flapper Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit

**Brand:** fluidmaster
**Price:** € 45.94
**Availability:** ✅ In Stock

## Summary

> 🚽 Upgrade your flush game—because your throne deserves the best!

## Quick Answers

- **What is this?** Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit by fluidmaster
- **How much does it cost?** € 45.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/433282442-fluidmaster-k-400h-039-high-performance-toilet-fill-valve-2)

## 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

- • **Tool-Free Installation:** No YouTube tutorials needed—install and adjust quickly with intuitive design.
- • **Universal Compatibility:** Fits most toilets with a 2-inch inlet, making upgrades seamless across your home.
- • **High-Performance Fill Valve:** Delivers a stronger, more efficient flush that revitalizes your bathroom’s functionality.
- • **Precision 2-Inch Flapper Fit:** Ensures a perfect seal for toilets made before 2000, eliminating leaks and wasted water.
- • **Durable Build with 7-Year Warranty:** Reliable plastic construction backed by a 7-year limited warranty for peace of mind.

## Overview

The Fluidmaster K-400H-039 is a high-performance toilet fill valve paired with a 2-inch adjustable flapper kit, designed for easy installation and reliable leak-free operation. Made with durable plastic and backed by a 7-year warranty, it fits most toilets manufactured before 2000, delivering stronger flushes and water efficiency. This kit is a top-rated, cost-effective upgrade that transforms your bathroom experience with minimal effort.

## Description

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

Review: INEXPENSIVE. 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.
Review: Jiggle handle no more - Running toilet no more! Finally stopped jiggling the toilet handle and replaced fill valve and flapper - this set came with both and arrived very fast. Followed instructions exactly and not only was it a perfect fit, it was simple to install - no more leaks

## Features

- Made in Mexico

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09NYLJ1FZ |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #430 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Toilet Flappers |
| Brand | Fluidmaster |
| Color | Multicolor |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,672) |
| Date First Available | September 8, 2021 |
| 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 |
| Installation Method | Toilet |
| Item Package Quantity | 1 |
| Item Weight | 13.6 ounces |
| Item dimensions L x W x H | 3.54 x 6.3 x 2.38 inches |
| Item model number | K-400H-039-T14 |
| Manufacturer | Fluidmaster |
| Material | Plastic |
| Maximum Operating Pressure | 80 Pound per Square Inch |
| Number of Ports | 2 |
| Outlet Connection Size | 2 Inches |
| Outlet Connection Type | FNPT |
| Part Number | K-400H-039-T14 |
| Product Dimensions | 3.54 x 6.3 x 2.38 inches |
| Shape | shape |
| Size | Universal, for 2 In. |
| Special Features | Adjustable |
| Specification Met | CSA, ULC |
| UPC | 039961031815 |
| Usage | Inside; Amateur, Inside; Professional |
| Warranty Description | 7 Year Limited |

## 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 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 2 Inches
- **Outlet Connection Type:** FNPT

## Images

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

## Available Options

This product comes in different **Size** 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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Jiggle handle no more
*by J***M on February 10, 2026*

Running toilet no more! Finally stopped jiggling the toilet handle and replaced fill valve and flapper - this set came with both and arrived very fast. Followed instructions exactly and not only was it a perfect fit, it was simple to install - no more leaks

### ⭐⭐⭐⭐⭐ Great choice, solid manufacturing
*by J***C on November 7, 2025*

Have 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.

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-14*