Fluidmaster 550DFRK-3 DuoFlush Complete Fill and Dual Flush Conversion System, 2

4.1 | 685 ratings

Price: 11.79

Last update: 06-21-2024

About this item

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

Product information

Technical Details

Material

‎Plastic

Brand

‎Fluidmaster

Exterior Finish

‎Chrome,Plastic

Inlet Connection Type

‎Barb

Valve Type

‎flush valve

Global Trade Identification Number

‎00039961004420, 00039961010100

Manufacturer

‎Fluidmaster

UPC

‎039961055095 039961004420 039961002037 039961010100 784497988453

Part Number

‎550DFRK-3

Item Weight

‎1.9 pounds

Country of Origin

‎USA

Item model number

‎550DFRK-3

Is Discontinued By Manufacturer

‎No

Size

‎2

Color

‎Beige

Shape

‎Triangle

Item Package Quantity

‎1

Cutting Diameter

‎8.19 Inches

Included Components

‎Rough Plumbing;Parts and Repair;toilet-repair-kits

Batteries Included?

‎No

Batteries Required?

‎No

Warranty Description

‎Warranty

Assembled Diameter

‎8.19 Inches

Top reviews from the United States

Barry O

Sort of easy to install

Reviewed in the United States on September 11, 2023

I installed this yesterday afternoon. The instructions are decent. This came with the adapter for an angled flapper seat. ( not sure what it’s called). This adapter has a putty seal around it. I noticed it wasn’t evenly placed on the bottom of the part. Spent a few minutes massaging it into place to get a good seal. Pressed it in place and continued installing. The handle is designed to move up for half flush and down for full flush. When you insert the handle in the tank, make sure it moves both ways. If it doesn’t, pull it out and rotate the part that fits into the tank a quarter turn and try again. If you take your time and read the directions it’s a pretty easy upgrade for your toilet.

Brian K. Reynolds

It depends on your toilet's flush performance

Reviewed in the United States on April 30, 2015

Installation was a breeze. I spent 10 minutes skimming over the instructions, and probably 30 minutes for installation and adjustment. Adjustment takes the longest amount of time, because you have to keep flushing the toilet and waiting for it to refill before testing the next adjustment.

I don't understand why some reviewers said that it took them so long to read the instructions and install the unit. I have lots of experience with replacing toilet fill valves and such, so maybe it was easier for me than it was for some people.

As one reviewer mentioned, you have to make sure that you get the most current version of this product. I chose the lowest priced option with free Prime shipping, and the product came from the seller named "Innovative Retail Market". I received the old version of the product from this seller, so I cannot recommend them. Fluid Master happily replaced it with the newer model 550DFRK-1 (the -1 indicates that it is the newer version).

I used my water meter to measure how much water my toilet used before I installed this unit. It used 1.9 gallons per flush (gpf). This is slightly more than the rated 1.6gpf printed on the toilet. I suspect that the difference has to do with the fact that the old fill valve over-filled the bowl a little, which allows more water to go down the drain.

When I installed the unit and new fill valve, I set the water level in the tank at the same height where it was before. This resulted in unsatisfactory results. Even with both adjustment dials turned to MAX, the toilet would not flush. So, I adjusted the new fill valve to fill the tank to the "max fill" line, which is engraved into the inside of the tank. This allowed me to adjust the dials to allow a complete flush with both liquid ("half flush") and solid ("full flush") waste.

The liquid adjustment was easy... if three sheets of toilet paper go down, the adjustment is correct. The solid adjustment took an extra day or two of using the toilet. I had to increase the solid adjustment once, in order to ensure a complete flush. I guess that was an extra-high-fiber day. LOL I eat lots of vegetables. I have been using it now for almost a week, and it works perfectly.

As they say, the proof is in the pudding. So, I wanted to measure the water savings. Your results will vary, because each model of toilet has a different flush performance. My toilets are not the best performing water-saving toilets I've ever owned, but I'm a renter now... and I think my landlord would probably get upset if I replaced the whole toilet!

With my current settings, a "full flush" uses 1.6 gallons, exactly what the toilet is rated to use. This is a savings of 0.3gpf, compared to what the toilet used previously. A "half flush" uses 1.3 gallons. While this isn't a huge difference (certainly not "half"), it is something... and would probably be better with a toilet which has a better flush performance score (yes, that's actually a thing).

I used to own my home, and I installed toilets which had a flush performance of 10.0 (the highest possible). I think that those toilets would probably flush liquids with far less than 1.3 gallons. Unfortunately, I never installed a duo-flush valve in them. At my new place of residence, the cost of water is double what it was at my old place... so I'm looking at ways to save water.

So... the important question is: "Is it worth the money to buy this device?" ...

I estimate that this unit will save me about 50 gallons per person, per month. At my current cost of water, that's about $1.00 per person, per month. Since I only paid $18.99 for this thing, it will pay for itself in:

19 months in a 1-person household
9.5 months in a 2-person household
6.33 months in a 3-person household
4.75 months in a 4-person household
etcetera ...

Of course, if you buy two or three of them for all of the toilets in your house, you need to double or triple the number of months I mentioned above.

In my case, yes... it was worth the money. I would have liked to see a lower gpf for liquid flushes, but... overall.. I'm satisfied.

Oh, I should mention something else. Some reviewers complained that the handle seemed flimsy. I disagree. I think it is sturdy enough. Maybe they didn't tighten it enough, allowing it to wobble in the hole?

Anthony W Gross Jr

Toilet parts

Reviewed in the United States on May 19, 2024

Great price

Greg Jones

good instructions

Reviewed in the United States on February 10, 2024

good instructions makes for a successful install, happy with the results. Installed on American Standard M #4112

Professional Dilettante

Works as Advertised. But. . .

Reviewed in the United States on August 20, 2019

Ok. I have four of the newer redesigned units with the center-pull cable. And so far have had only one of the units fail in the 3+ years they've been installed. It failed in the most heavily used (guest) toilet. Twice. Since I've had no problem with the other three, I decided to take the unit apart to see why it failed. In both failures, the problem was not cable (redesigned cable ends remained firmly affixed), but the actuating mechanism. The first time, the spring simply broke. A year later, the replacement unit would only half flush, not full flush. This was because the grooved sleeve for the splined shaft of the flush handle split at the link. I think the solution to this might be to tweak the dimensions and plastic formula of the links and design the actuator to mount horizontally and or reorient the spring so that it spends less time submerged in the tank. In any case, you did a good job addressing the Gen 1 issues. Another iteration and you're good!

Lydia

Worst plumbing product I have ever used.

Reviewed in the United States 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.

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