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Questions and Answers for Fluidmaster DuoFlush Complete Fill and Dual Flush Conversion System

Internet #204667552

Model #550DFRK-3

Store SKU #1000028233

  • Convert your toilet to a dual flush water-saving system
  • Easy install for 2 in. valves, without removing the flush valve
  • Fully adjustable, includes the high powered PerforMAX fill valve

Questions & Answers

35Questions
caret
Q:Is the Model # 550DFRK-3 the new updated version? I don't need or want to go through the hassle of replacing mine with a version that will break in a year.
by|Mar 14, 2018
5 Answers
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A:  I can't accurately respond. to your question. The manufacturer can best describe the differences / improvements in their various models. All I can say is that mine has been in service for about a year, and i have no issues with it. I did mount the handle vertical, to clear the tank lid. From what i see/read is the primary issue is in the cable routing between the handle and the valve assembly.

by|May 5, 2023

A:  Not sure if the newest, mine has been installed for 2 plus years. Never found a system that lasts for long periods of time, nor have I searched out ones which will break in a year. Wasn't aware they specifically marketed those. In any case, Home Depot has an excellent return policy if your plumbing item fails within its warranty period, as does Duo-Flush. Good Luck

by|May 5, 2023

A:  The newly designed model has no tube on the side and the cable enters the canister from the top.

by|Mar 9, 2019

A:  I just installed mine, so far so good ... keep ya posted on how long it lasts ... be careful and spread the putty if you have a angled 2" drain on the overflow valve

by|May 6, 2023

    A:  I also had the older version. My slanted seal was good everything was fine I just replaced the part that was bad, works great.

    by|Jan 12, 2020
    caret
    Q:1) The toilet does not flush completely unless handle is held for a full flush. What needs to be done so handle does not have to be held? 2) Half Flush has to be set to 8 in order to flush. This seems to defeat the purpose of water conservation if it's almost set to the same as full flush. What can be done to improve on water conservation? Thanks.
    by|Feb 3, 2018
    7 Answers
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    A:  On this model you have a water level setting and then two additional settings. One for partial flush and the other for full flush. There are no shortcuts to set this unit. You must follow the directions exactly to get good results.

    by|May 5, 2023

    A:  The two adjustments are independent of each other. I set both to max and there is a difference in the amount of water used between full and half flushes. I think you might be having the same issue that I have with mine. If you used the Angle Seat Adapter it cuts down on the flow rate just a little bit. Also the valve itself does not open as far as the original valve, both cutting down on the volume of water delivered to the bowl. On my toilet it's enough to require 2 full flushes to get rid of solid material. The half flush works fine with liquids. In your case you get the full flush but only when holding the handle down so your slightly ahead of were I am. How to get it to work without holding the handle? I don't think you can without changing back to the original configuration.

    by|May 5, 2023

      A:  I have the same problem. I think it is a design flaw. It is not much of an issue with the half flush, but the full flush seems to have to be set on full, and the handle held to completely flush solids. We just do it.

      by|May 5, 2023

        A:  I also had the problem that many people who have the Duo Flush Fluidmaster are complaining about. I couldn't get a full flush unless I stood there and held the handle down until the tank was nearly empty. It was an irritating waste of time, but I finally figured out why it happens and now my toilet will do a full flush with only one quick press and release of the handle and I can finally walk away without worrying about leaving a nasty mess in the toilet bowl. Here's how I solved the problem: We have all been focused on the two knobs on top of the tank drain valve in the center of the tank, when we should have been focused on the tank refill valve on the side of the tank. The smaller valve controls how much water fills the tank, because it has a cylindrical float that controls when the water refill valve shuts off. The refill valve is completely independent of the two controls on the tank dump valve in the center of the tank. So, what does the refill valve have to do with this problem? It's a matter of fluid dynamics and the force of gravity: The rapid flow of water that suddenly streams out of the toilet tank when the tank drain valve opens is what holds the drain valve open. The water flow drops off as the tank empties and gravity finally takes over and closes the drain valve. If there is not enough water pressure in the tank, then the flow will be too weak to hold the valve open as the tank drains and the valve will close prematurely. The tank empties due to gravity, so the initial water pressure at the bottom of the tank depends on the height of water in the tank when you press the flush handle and that is controlled by the tank refill valve located on the side of the tank, not the dump valve located in the center of the tank. When I purchased my Fluidmaster Duo Flush the refill valve was pre-adjusted to fill my tank half full and I saw no reason to adjust it at that time, so I left it that way. The problem is, that setting caused the problem that forced me to hold down the handle, so the solution is to turn the knob on the end of the rod that connects the shut-off valve to the cylindrical float clockwise until it stops. This will raise the water level in the tank sufficiently to produce an initial flow that's strong enough to hold the tank drain valve open until the tank is nearly empty. I also rotated the blue full-flush knob on the tank dump valve to max and the green low-flush knob to min, but this won't solve the problem unless you also raise the water level in the tank by rotating the knob on the rank refill valve fully clockwise. Will this defeat the advantage of having a Duo Flush system? Probably, but I don't care, because nothing is worse than having to decide between standing there for what seems like an eternity, or leaving a smelly mess in the toilet bowl for the next person to find. Not to mention the embarrassment of having to tell guests that they have to stand there and hold down the handle until they see everything in the toilet go down the drain. One last thing, make sure your handle is installed with the arm of the flush handle pointing outward. It's possible to install the Fluidmaster flush handle with the flush handle pointing inward and this will work, but it will cause a low-flush when you push the flush handle down and expect a full flush. One last thing, if your tank has a slow leak, then try this: Rotate the flush valve housing in the center of the tank until the words "Push Down to Turn" face the left side of the toilet. This may not work on every toilet with a Fluidmaster valve that has a slow leak, but it stopped a slow leak in my toilet that was discoloring my toilet bowl. Happy flushing to all!

        by|Feb 10, 2019

          A:  I can't find a way to edit the comment I made on 02/09/19 so I'm adding this addendum.   The explanation I gave for why the tank dump valve stays open after the flush handle is pressed was speculation based on the fact that I took a Fluidmaster Duoflush unit apart and I couldn't find an air bladder.   A standard flapper dump valve contains an air bladder and it's the buoyancy of air trapped in the flapper that holds the valve open while the toilet tank drains.  I said the Fluidmaster held the drain valve open with force from water draining from the tank.   However, that was only a conclusion I jumped to when I couldn't find an air bladder in the Fluidmaster.   I failed to explain that I was only speculating about how it worked.   After I posted my previous comment, I looked at some of the Fluidmaster patents, which are on-line, and it appears that there actually is a buoyancy chamber in the Fluidmaster Duoflush, it's just not sealed up, or located in plain sight.  Apparently, in the case of the Fluidmaster Duoflush, the air bladder has been replaced by an open-top vessel that's hidden in the tall cylindrical tube and the open vessel takes the place of a submerged air bladder.      The important thing to take away from this addendum is that the answer I gave is still correct and these detail's about what holds the dump valve open when the tank drains are not important, unless you happen to be a purist.  The problem with having to hold down the flush handle to get a full flush is still due to having a low water level in the toilet tank, which in turn is due to the adjustment of the float on the tank's refill valve.   And, the solution to the problem is still to rotate the adjustment knob on the refill valve completely clockwise to get the tank to fill to the maximum level and that will make the need to hold down the handle to get a full flush go away.   I'm sure it's possible to optimize the water level in the tank and get the dual flush feature to work as advertised.  Fluidmaster does explain the entire adjustment process, assuming you're smart enough and patient enough to read and understand their instructions (I was neither).   I tried to get it to work as advertised, but I ran out of patience and gave up, so I can only tell you how I was able to adjust the Fluidmaster so I didn't need to stand there and hold down the handle until I got rid of all the solid waste in the toilet bowel.  If you want it to work exactly as advertised, then forget this and read all the instructions (I wish you luck). 

          by|Feb 13, 2019

            A:  Buy a purpose-built dual flush toilet. Sounds like you have an older toilet where water flow was not optimized for 1.6Gal or less.

            by|May 6, 2023

            A:  I have not experienced that problem. Mine is set as the picture attached indicates. Perhaps the manufacture's web page may be of help and offer suggestions on 'tuning the valve'. https://www.fluidmaster.com/products/toilet/flush-valves/550dfrk-dual-flush-conversion-system/

            by|May 5, 2023
            caret
            Q:Customer complained that the handle does not return to the center position after the flush. Fluidmaster support says this can occur if the handle is not fully seated in the black box preventing the handle to return to center.
            by|Jan 17, 2018
            5 Answers
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            A:  The solution is to hold the handle down (or up if doing a quick flush) until the flush is complete. Then release it quickly. Otherwise the stopper won't shut off and the water will keep running during the fill process. You shouldn't have to do it that way but that's the only way I could get it to work properly. I am not entirely happy with the product.

            by|May 5, 2023

              A:  also make sure the wire from the handle is not too twisted during the install, this will prevent the handle from working

              by|May 6, 2023

                A:  Perhaps you have a sharp bend in the cable that provides too much resistance for travel?

                by|May 5, 2023

                A:  I had 2 issues, one each with 2 toilets & had to purchase new units to fix. The newer unit is stronger plastic & different shape & have had no problems so far.

                by|May 5, 2023

                  A:  You may have to turn the part that fills the water tank slightly more towards back of tank. It may be getting caught on the float.

                  by|Jan 1, 2019
                    caret
                    Q:I've had my unit for about 2 years. It's began to leak a couple of months ago. What could be the cause of the leaking and how do I fix it?
                    by|Oct 24, 2017
                    4 Answers
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                    A:  Likely the gasket. Doesn’t look easy to disassemble, but if you can and find a compatible gasket, that should solve your issue. If not, then it’s the flush stack to basin that’s leaking. Those are cheap but require removing the basin. Get all new hardware and gaskets if you do that.

                    by|May 6, 2023

                    A:  not sure what you mean by leak but if you mean a leak that drips on the floor it is a bad seal between the unit and the tank.

                    by|Jun 30, 2019

                    A:  Check the wax seal at the bottom.

                    by|Jun 30, 2019

                      A:  If water is leaking into the lower bowl then the canister flapper is not sealing correctly. Pull the canister straight up to remove. Clean the seal and flapper of any slime. Check to make sure the plastic slant seal is still attached properly.

                      by|Mar 9, 2019
                      caret
                      Q:Can this be use with dual flush top lever?
                      by|Sep 17, 2017
                      5 Answers
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                      A:  I don't believe so. That would need a different model. This model is meant to convert a single flush toilet into a duo.

                      by|Mar 12, 2019

                      A:  No, it needs a standard handle to work.

                      by|Mar 9, 2019

                      A:  This product is compatible.

                      by|May 4, 2023

                        A:  I would say no. A lever designed for this system is provided in the kit. Cannot see how top-mounted controls can be adapted to this.

                        by|Dec 10, 2019

                        A:  yes

                        by|May 6, 2023
                          caret
                          Q:I broke the handle. Anyway to get just the Handle?
                          by|Jul 17, 2017
                          5 Answers
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                          A:  I am unable to find one at Home Depot. I have been to the Fluidmaster website, and there is no handle only repair kit. Seems for now spare parts are NOT available. I have emailed Fluidmaster asking for a new unit under their 5 year limited warranty. I will report back once I get their reply.

                          by|May 5, 2023

                            A:  Dear Valued Customer: We apologize for your experience with the Duo Flush System Toilet Converter. For help with your product warranty please contact Fluidmaster at your earliest convenience. Fluidmaster’s Technical Service Department is 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.

                            by|May 4, 2023

                              A:  No, they will send you a completely new re-designed canister and handle setup. fluidmaster_support@mailmw.custhelp.com

                              by|Mar 10, 2019

                              A:  In the instructions, it says that you don't need to replace your old handle if you don't want to. From what I can determine, you could just purchase a generic replacement handle from your local supply store.

                              by|Mar 13, 2019

                              A:  Contact the company

                              by|Mar 25, 2020
                              caret
                              Q:Red blue dials which is for the up and which and which is the down?
                              by|Jul 2, 2017
                              3 Answers
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                              A:  It says on the unit

                              by|May 6, 2023

                              A:  Hello Richard: Thank you for your question concerning Duo Flush System Toilet Converter. The dial colors are blue for a full flush and green for a partial flush. By setting these adjustable dials you can control the amount of water being flushed. The toilet handle goes up for a partial flush and down for full flush operation.For additional questions on the Duo Flush System Toilet Converter or any Fluidmaster product please contact us at your earliest convenience. Fluidmaster’s Technical Service Department is 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.

                              by|May 4, 2023

                                A:  on top of the unit next to the dials is a circle the one this haft colored is for the 1/2 flush the circle with no color is for the full flush.

                                by|May 5, 2023
                                caret
                                Q:Will this fit into a Kohler 3386 ?
                                by|May 5, 2017
                                3 Answers
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                                A:  Thank you for considering using the Duo Flush Conversion Valve. Unfortunately, The Duo Flush Conversion kit will not work in "Low Boy" toilets like the Kohler 3386. Due to this toilets low profile the water level will not be high enough for the valve to function properly.

                                by|May 4, 2023

                                  A:  I can't answer for sure.... Kohler toilets generally use a larger diameter flapper valve then other manufacturers, so I'd say probably not. However, that is a question you should post on Kolher's web page for questions. Look at the diameters of the Duo vs Kohler flapper / flush valves....

                                  by|May 4, 2023

                                  A:  My understanding is that this is universal but you can call 1-800-631-2011 M-F 5:30AM - 5:00PM PST.

                                  by|May 4, 2023
                                  caret
                                  Q:My handle, made of sturdy plastic, has broken and it seems that the flushing mechanism is really tight. Is there a to purchase and replace the handle and cable mechanism without replacing the whole unit?
                                  by|Mar 28, 2017
                                  3 Answers
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                                  A:  I emailed support, and received an immediate reply. Fluidmaster sent me a replacement part no questions asked.

                                  by|May 5, 2023

                                    A:  Not at my home Depot. It looks like there are no repair parts for this unit. IMHO the handle is not sturdy enough. The square plastic rounded off and failed suddenly. There are no spare parts on the Fluidmaster website for this unit. I am asking Fluidmaster to replace the handle, or the whole unit if the handle is not available.

                                    by|May 5, 2023

                                      A:  Dear Valued Customer: We apologize for your experience with the Duo Flush System Toilet Converter. We have a new Duo Flush System that now comes with a stronger and larger toilet handle as well as a more durable flush cable to enhance product functionality. For help with your product warranty please contact Fluidmaster at your earliest convenience. Fluidmaster’s Technical Service Department is 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.

                                      by|May 4, 2023
                                        1 found this answer helpful
                                        caret
                                        Q:Can I use this on a Penguin dual flush toilet?
                                        by|Jan 18, 2017
                                        2 Answers
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                                        A:  No. The handle actuator is permanently attached.

                                        by|Mar 9, 2019

                                        A:  Dear Valued Customer: Thank you for your question concerning Duo Flush System Toilet Converter. In most Penguin toilet you canIn most cases you will need to purchase and install a new Flush Valve and Penguin recommends to use an Extra Thick Tank to Bowl Gasket. For additional questions on the Duo Flush System Toilet Converter or any Fluidmaster product please contact us at your earliest convenience. Fluidmaster’s Technical Service Department is 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.

                                        by|May 4, 2023