ZONE INDUSTRY CORP. Dual Flush Valve, Push Button, Converter Kit, Replacement, Water-Saving, UPC & CUPC Listed Toilet Repair Kit, with Gasket and Bolts Kits, for Use with Standard 2-inch Flush Valves

I have had much trouble with drop-in dual flush adapter kits that mate to an existing flush valve. It's hard to get them to seat properly, and the tank level drops over time causing the fill valve to trigger and top the tank off. This dual flush valve replaces the flush valve completely. It is a little more work to install because you have to unbolt the tank, remove the flush valve, and attach this assembly. You also need a new tank to bowl gasket kit (not included) for the best result. However this is worth the effort because it does not leak. Don't buy adapter kits. They might work, but in my experience this is a better solution. I've done 2 toilets with it so far. I have a 3rd Danco adapter that isn't leaking, but if it starts this will be ordered immediately with confidence. Note: I can't speak to the durability yet, as I haven't had them in long. The quality seems to be on par with the Fluidmaster and Danco adapter kits they replaced.

Installation was easy and the operation was good, but I had problems with the fill valve running every 10 minutes or so.Zone industries support worked with me over a weeks time to determine the problem. Even sent me another one to try. When installed this one I had the same behavior, exactly the same loss rate, this seemed odd.Finally found the issue was I had pushed the bowl fill hose down well below the water line inside of the overflow tube. This was causing a siphon effect and would slowly drain the tank down until the water level dropped below the height of the hose. Once I corrected my error the product worked perfectly.Product installed as expected, operates as expected and tech support was involved and committed to helping me get to the bottom of the issue!I would recommend this to anyone wanting to convert their toilet to dual flush.

I just installed this on my toilet, which was a huge pain and not nearly as easy as their video makes it look. Well, after 3 hours and a trip to the hardware store it’s on the toilet and the toilet’s not leaking. However, there is no difference in the amount of water used between the different types of flushes if I hold the button down through the entire flush. If you want to save water then hold down the #1 button for a short time only. I followed the directions, I watched YouTube videoso, I did what the directions said to adjust the water per flush. I don’t understand why there are instructions on how to adjust the flush volumes when it really only matters how long you hold down the buttons and not any of the adjustments to the device. I will keep it because it is saving water, but I might try a different brand for my water saving adventures on the other toilets in the house.

I'm really happy with this. I replaced similar Danco and Fluidmaster dual flush valves that developed inexplicable leaks. Both eventually started leaking and caused the toilet to run about once every hour, probably using a gallon of water each time. This product went in much easier and being less tall and generally smaller, it fit my tank better. The seal design seems to be superior having a flat disc that drops down and caps the outlet much like a traditional flapper. The Danco had an unusual, large, asymmetric rubbery thing that pushed down into the outlet with the flow control occurring somewhere above. I believe the Danco developed poor sealing at the outlet due to this odd design. I'm hoping this product will be more reliable and last longer. It sure looks like it will be.

Screws and washers to retain water tank to toilet.