---
product_id: 11587145
title: "Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System"
brand: "Fluidmaster"
price: "฿4245"
currency: THB
in_stock: true
reviews_count: 16
category: "Hi"
url: https://www.desertcart.co.th/products/11587145-fluidmaster-550dfrk-3-duoflush-complete-fill-and-dual-flush-conversion
store_origin: TH
region: Thailand
---

# Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System

**Brand:** Fluidmaster
**Price:** ฿4245
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System by Fluidmaster
- **How much does it cost?** ฿4245 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/11587145-fluidmaster-550dfrk-3-duoflush-complete-fill-and-dual-flush-conversion)

## Best For

- Fluidmaster enthusiasts

## Why This Product

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

## Description

Product Description
        	
        	
        		
        			The Fluidmaster 550DFRK Duo Flush System gives you a tool to help use less water and save more money. A complete fill and dual flush conversion system. The Dual Flush System retrofits into any 2-Inch flapper toilet and uses up to 45-Percent less water than the original tank parts. Suitable for 1.6 GPF and higher 3.5+ gallons per flush models. The durable silicone seal lasts for years. While the PerforMAX valve regulates water flow and improves overall performance. Adjustable for both full and half flush, with a 5-year warranty. Fully adjustable for a wide range of settings without removing the valve. Parts included with Duo Flush Complete System purchase include: Dual Action Handle, PerforMAX Fill Valve, DUO Flush Valve, Refill Clip, Refill Tube, Shank Washer, Fill Valve Locknut, Angled Seat Adapter (optional), Dual Action Handle Locknut, Roller Clamp, and Hose Clamps.
				    	
					
        		
        		
        	
        
        	
        		From the Manufacturer
        	
        	
        		
        			Fluidmaster the #1 toilet repair brand in the world. Fluidmaster&#x2019;s complete line of toilet repair parts includes fill valves, flush valves, flappers, tank levers, dual flush valves, bowl wax, toilet repair kits, seals, connectors and more, and are found in more toilets than all other brands. The customer&#x2019;s first choice and preferred supplier of toilet tank trim since 1957. With manufacturing facilities across the world, Fluidmaster reaches over 90 countries worldwide with unparalleled quality.

## Features

- Convert your existing 2” flush valve toilet to Dual Flush technology
- Save water & money, uses up to 45% less water
- Retrofits to any 2” flush valve toilet, 1.6 GPF and pre 1994 3.5+ gallon per flush models
- Easy-to-install and fully adjustable for a wide range of settings, without removing the valve
- Complete fill & dual flush conversion system
- Full and half flush, Dual Action toilet flush lever included
- Replace noisy and slow filling inefficient models
- PerforMAX High Performance Fill Valve included for 2x greater refill rate
- Durable build with a 5-year warranty

## Images

![Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System - Image 1](https://images-na.ssl-images-amazon.com/images/I/41mcdEo9wKL.jpg)
![Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System - Image 2](https://images-na.ssl-images-amazon.com/images/I/41O5MSUIV5L.jpg)
![Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System - Image 3](https://images-na.ssl-images-amazon.com/images/I/41PwI5I5AXL.jpg)
![Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System - Image 4](https://images-na.ssl-images-amazon.com/images/I/51FjvdKeCML.jpg)
![Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System - Image 5](https://images-na.ssl-images-amazon.com/images/I/51qb5oBlqaL.jpg)

## Customer Reviews

### ⭐⭐ Leaky leaky...
*by C***L on August 17, 2015*

We installed two Fluidmaster dual flush systems within the past year and each leak.  The seals starting deteriorating for some reason after about six months and the water leaking / toilet running.  No chemicals were placed in the tanks.  Very frustrating...

### ⭐ Worst plumbing product I have ever used.
*by J***N on September 10, 2015*

I wish I could rate this thing with negative stars; I'd rate it negative 1,000,000.  I literally cannot imagine anything more frustrating than wasting my Labor Day holiday installing, repairing, uninstalling, and replacing plumbing that never worked from the moment it left the package.First of all, the design flaws on this thing are very well documented.  One reviewer helpfully warned us that the Amazon vendor was mailing out a completely defunct original model.  Sure enough, Amazon sent me an old, faded box with the original model number.  The reviewer said that Fluidmaster would send a free adapter, but I called and they refused.Next, I went to Lowes to get the updated model--which still has problems such as leaking.  Installation got off to a bad start when the shutoff valve crapped out.  It was soldered to the copper line and the only shut off ahead of it was for the entire house.  So, I shut off the water to my entire house and hurried to the hardware store to buy specialty tools and a replacement valve.The instructions allege that this thing can be installed in a couple of hours, but I decided to take my time because of all the well-documented problems with this device.  After spending most of the day carefully installing this thing, I was worried about leaks--as this was the most cited problem.  Unfortunately, I never got that far.When I went to test-flush the thing, it would not consistently flush.  I followed the trouble shooting guide, and I even tried to call Fluidmaster.  They close for all holidays and weekends, but they also close daily at 3 or 4 p.m. Pacific Time, which is practically midday for the rest of us.  I kept increasing the amount of water in the tank and the amount of water per flush (which sort of defeats the purpose), but it never flushed consistently.  It flushed somewhere between 1/3 and 2/3 of the time.  My guess is that the handle/cable system has too much slack to consistently activate the flush.  This also forced me to replace the line from the valve to the toilet, but I misjudged the length.  Back to the hardware store.Regardless of why this thing doesn't work, it is incredibly frustrating to spend an entire day installing, repairing, uninstalling, and replacing this exceptionally poor product.  I will never buy another Fluidmaster product again, if I can help it.  In fact, even when I had to replace the line in to my toilet, I refused to buy Fluidmaster.

### ⭐ NOT THE RIGHT MODEL... VENDOR IS SELLING AN OUTDATED VERSION-MODEL WITH AN INFERIOR SEAL!!!
*by S***D on April 23, 2015*

First of all, the NEW and REDESIGNED product line works great!  However, this vendor is selling an old version of the product that has an inferior seal.  I compared the one I bought at Lowes today with the one  from this vendor that I installed yesterday (and de-installed today).  The seal, the critical part has been totally redesigned by Fluidmaster.  The current model has a retaining ring on the top of the silicon seal that insures a solid, water-tight fit.  The older model doesn't.  On the third use of the product shipped by this vendor, the seal wouldn't come down completely, allowing the toilet to run and drain for about a half an hour until I caught it.I purchased this product, because I had purchased/installed one before (from Lowes) and it worked flawlessly.  That's why I bought the product from Amazon in the first place, since it was a better price point.  However, when the product arrived from the Amazon vendor, I immediately noticed the packaging was a different design than the one I had previously purchased and installed.  I knew there was something up with this version of the product and a subsequent close inspection of the seals confirmed that suspicion.  The current, updated version of the product works perfectly.  Evidently, this version shipped by the Amazon vendor was superseded with a new design by the manufacturer, who was probably aware of the failings in this model.The good news is that after I called Fluidmaster and they agreed to send me a new unit, so the company gets FIVE STARS for customer service.  This vendor gets the one star, because not only are the units they are shipping are outdated and flawed, but I initially ordered 2 of these and one came cracked, so I returned it for credit. (AMAZON gets FIVE STARS for customer service also.)

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**Shop now:** [https://www.desertcart.co.th/products/11587145-fluidmaster-550dfrk-3-duoflush-complete-fill-and-dual-flush-conversion](https://www.desertcart.co.th/products/11587145-fluidmaster-550dfrk-3-duoflush-complete-fill-and-dual-flush-conversion)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-17*