The product you chose is discontinued, but we found something similar you might like.
Duo Flush System Toilet Converter
  • Fluidmaster
  • Model 550DFRK-3
  • Internet #204667552
  • Store SO SKU #1000028233

Duo Flush System Toilet Converter

$2498 /each
Discontinued Model:

Model # 550DFRK-1

Internet #203682806

Fluidmaster Duo Flush System

Discontinued Fluidmaster

Duo Flush System

store icon Loading Buying Options...
package icon Loading Buying Options...
Sorry, but we ran into issues loading these options. Please try refreshing.

Frequently Bought Together

Product Overview

The Fluidmaster Duo Flush System allows you to quickly convert your existing toilet into a Dual Flush toilet. Duo Flush enables you to use less water by offering two different flush settings, one for liquids and one for solids, and with Duo Flush technology you save water without sacrificing flush performance. Duo Flush replaces the toilet flapper, thus eliminating potential leaks in the future. The DUO FLUSH System also comes with PerforMAX Fill Valve to maximize your toilet performance and water savings. The PerforMAX Fill Valve is the quietest and most powerful fill valve sold.

  • Made of durable corrosion resistant materials
  • Use up to 45% less water
  • Fits more toilets than any other dual flush conversion valve
  • Easy adjust top mounted dials allow for easy water level adjustment and eliminate the need to remove the valve while making adjustments
  • Fits most toilets with a 2 in. flush valve (not compatible with Mansfield or toilets with 3 in. flush valves)
  • Installs in less than 10 minutes with snap-on swivel mount for tool free installation with no tank removal
  • Includes chrome dual action tank lever and all necessary hardware



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Adjustable Fit
Yes, Fill Vale fits most toilets and adjust from 9" to 14" and DUO FLUSH Valve fits toilets with a 2" Flush Valve
Dual Flush
Hardware Included
Includes Flapper
Plumbing Part Type
Toilet Flush & Fill Valve
Valve Type

Warranty / Certifications

Manufacturer Warranty
5 years

More Products With These Features


Customer Questions & Answers


Is this a universal item. Will it fit all toilets?
Asked by: flaco
It comes with various adaptors to fit most toilets. But it does not WORK universally, despite fitting. See my review.
Answered by: NotSavingWater
Date published: 2015-09-21

Is the Fluidmaster Duo Flush System in stock at my local Home Depot ?

Asked by: Anonymous
I would say that it is most likely, as it is in my area, it's in stock at all of them or at lease normally stocked. Within 25 miles.
Answered by: Retired297
Date published: 2015-11-07

Does the flush handle come in bronze color?

I have only seen chrome colored flush handles, do they come in bronze as this better matches my decor?
Asked by: Picky
Unfortunately, no. That was my initial hesitation, since we have all custom hardware in our bathrooms. Still, it is a clean appearing handle if it doesn't clash too severely. I contacted the company and they indicated that they don't currently offer any options. (Not holding my breath, but if enough people raise the issue, maybe they will consider answering the call.) No shame in being picky! Hey, I'm also picky too or I wouldn't have spent bucks for custom hardware in the first place.
Answered by: Dave
Date published: 2016-04-07


I have installed this item and used it for a couple of years. The cable has broken where it attaches inside the flushing mechanism. I see a statement of a five year warranty, how do I get a replacement?
Asked by: wrs44
I cannot answer this call the makers
Answered by: Toptheo
Date published: 2017-06-22
  • y_2017, m_8, d_14, h_1CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_9
  • loc_, sid_203682806, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 17ms

Customer Reviews

Duo Flush System is rated 2.7 out of 5 by 99.
Rated 4 out of 5 by from Wonderful Idea I like the concept of saving water. The option of flushing for liquid waste using about half the water opposed to solid waste. Is a good idea. The instructions on how to install the flapper modification was difficult to understand initially. May have just been me, but the install was easy other than that. The cost is more than a conventional float system, but the environmental impact is with the cost for me. Not sure I'll save money because I don't think my water company reads my meter. Setting the system for the amount of water you need to flush was easy and effective.
Date published: 2017-06-10
Rated 5 out of 5 by from Great change from previous versions, perfect refit kit I've used a number of these kits in the past, each of them required the full dissasembly of the toilet to replace the connection of the bowl to the tank in order to work. Instead, this came with a clip and seal that attaches to the old flap base, and the new flush mechanism clips to that. I'm a bit worried that the seal will degrade causing the toilet to run / flush constantly, but there's no actual sign of that yet.
Date published: 2017-06-09
Rated 1 out of 5 by from Will not work in Toto one piece toilets Unfortunately all 3 of the toilets in my house are Toto one piece toilets which have a 3" opening for the flush valve. These units are built for the standard 2.5" opening and therefore would not fit these toilets. I was not going to give any stars since I can not honestly review this product but the system requires at least 1 star. This does not mean I thought it was a bad product, just that I was unable to use it.
Date published: 2017-06-18
Rated 4 out of 5 by from Easy to use flush conversion system This product idea is a very good idea. I think it is not widely known. We put this in the main bathroom because we wanted to use it. However we constantly found ourselves telling people how to use it. Which can be a little awkward. I would recommend putting this in a personal bathroom. That being said it was relatively easy to install. Once installed it works very well. As a result I would recommend this product.
Date published: 2017-06-09
Rated 4 out of 5 by from Will save you money! I installed the fluidmaster dual flush conversions system in my bathroom toilet. The instruction was step by step. It took me about 30 minutes, start to finish. Had no issues installing it. It has a two part flush handle for light flush push handle down half way, or heavier flush push handle down all the way. I like that it will save my family money and it also conserves water.
Date published: 2017-06-19
Rated 4 out of 5 by from Very innovative product It is a very nice plug and play unit. Comes with a extra mount on the fill valve to accommodate most toilets. It has plenty of flushing power in both modes. It is adjustable but I didn"t have to change the settings at which they were set at out of the box. I would definitely recommend to others . Hopefully it saves as much water as estimated.
Date published: 2017-06-09
Rated 5 out of 5 by from My original review of 2/22/16 was unfavorable. The new model with the cable going into the top an... My original review of 2/22/16 was unfavorable. The new model with the cable going into the top and NO clear corrugated hose, is a vast improvement. Easy to operate. Well done FM. You should get some kind of design award for the new one. Don't buy the old model regardless of sales price.
Date published: 2017-06-24
Rated 3 out of 5 by from Did Not Fit My Toilet I like the design of this product and I was looking forward to using it to save some water but unfortunately it did not fit my toilet which had a 2" drain. If your toilet has a 3" drain it should work OK. It can be difficult to tell from the packaging exactly what toilets this works with.
Date published: 2017-06-23
  • y_2017, m_8, d_18, h_3
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_99
  • loc_, sid_203682806, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 15ms