How to Install Danco Next Duo Flush Conversion Kit and Review 

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You're welcome! Yep, I think I had to make some minor adjustments after it was a few years in service. Eventually a plastic piece broke in the fast-fill valve and I had to replace that part, but at least it was sold separately and I was able to get the same part from a big box store. Good luck with the repair!

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You're welcome! Our unit is in its 4th or 5th year or so and we finally had to replace the fast fill valve mechanism. The replacement stand alone fast fill valve comes with the self-cleaning J-tube: geni.us/Qxcg [Amazon Affiliate Product Link] Not sure why they wouldn't include that with the full kit tho! 🤷

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True, in the US, water is inexpensive and averages out to less than a penny per gallon, so from a cost savings standpoint it may not seem like a great incentive. But viewing water as an unlimited resource ignores the fact that many parts of the US experience periodic or frequent droughts (roughly 30% of the country experienced some measure of drought as recently as last month according to the US gov't drought monitor) making water conservation essential in those communities during those times, which can last for months on end, or years in some states. Abundant may be the overall trend, but isn't always true for localized points in time in all places. Plus I think folks feel good about saving water to preserve the environment by way of reducing the energy required to process and deliver water, minimizing pollution vectors, and conserving related fuel resources. A quick note on why I think the dual-flush didn't work in our guest bath: we already had a water conserving tank on that toilet (hence its shorter height) and since it used less water than a standard tank (3.5 gpf), the dual flush wasn't really an appropriate modification because there wasn't enough water in the tank to make it function correctly and the conservation benefit was not as pronounced, though this was not realized until after I completed the installation. The conversion kits works quite nicely in our standard-sized toilet tank.

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To lower the water level in the bowl after a flush, you'll need to adjust the height of the float by turning the thumbscrew shown at 3:19 and lower it. The water level inside the toilet tank is directly correlated to the water level in the bowl after a flush, so lower the height in the tank should lower the amount of water in the bowl correspondingly. Hope this helps!

I did notice the boxes on the store shelves aren't sealed... so perhaps it "fell" out or someone needed a replacement J-tube and I got unlucky. Thankfully, it's optional and my unit works fine without it!

Hm, usually 2-3 wraps of plumber's Teflon tape on the threads of the connection that is leaking will be sufficient to stop a small leak. Wrap the tape in a clockwise direction (same direction as you turn the connector to tighten it) and be careful no to leave any excess tape hanging off past the last thread. Using too much tape can also cause the threads not to catch and the connection to leak.

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Hm, the quick flush is the inner "smaller" lever. If the blue float is all the way up and it's still using all the water in the tank, perhaps the handle is getting stuck on something? If the handle is held down or stuck and the flap stays open this would potentially use all the water in the tank every time. Perhaps the Danco techs can better help you out? www.danco.com/support/

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Hm, without looking at what the bubble looks like I can't tell if maybe your rubber gasket is deformed or not. If so, perhaps you could exchange it and see if the new unit also has this "bubble." One thing I did notice once when installing one of these units is that if I pushed down too much when installing it, it would create a "wrinkle" in the seal that allowed water to leak down into the bowl. It may seem counter-intuitive, but lifting up on the unit slightly may eliminate the leak by allowing the gasket to meet all the edges of the drain hole for the tank. The unit only needs to be pressed down enough to create a good seal. Pushing it in further, past this point, for "a tighter fit" could actually backfire.

So there are a couple things to try. It sounds like you've already tried adjusting the fill float level (see 3:14) by raising the float and allowing more water to fill the tank. If that hasn't worked, try adjusting the water usage floats (green and blue). Move the blue float up to use less water (see 3:24) during a quick flush and push the green float down to use more water for a full flush (see 3:34) and hopefully you'll be able to see a bigger difference in the volume between the two flushes.

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My kit didn't come with the optional J-tube so I could not cover it in the video. The J-tube basically stirs up the water that settles at the bottom of the tank each time you flush in order to help prevent residue/sediment build up in the bottom of the toilet tank, so its purpose to to keep the tank clean.

Hm, for this issue, Fluidmaster recommends flushing the fill valve or replacing the cap assembly with a new one. You can find the detailed steps for that here: www.fluidmaster.com/toilet-problems/toilet-wont-fill-slow-filling-tank-remove-fill-valve-cap-replace-seal/

To adjust the valve height, grasp upper portion placing your thumb on gray side of the mini-valve and push clockwise ¼ turn. Then slide the upper body to adjust it up or down (see 1:21).

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Leaking typically means the seal between the fill valve and opening in the tank is not watertight. This can be due to insufficient contact between the blue rubber seal and the rim of the hole (left a little gap) so pressing down a bit on top may help create a better seal. Just be careful not to overdo it because pushing the gasket in the hole too far can also cause leaking if the seal gets wrinkled. In this case the unit would have to be backed out slightly until the gasket is secure against the open but not forced down into it. I hope this explanation is clear.

No, the packaging states 'Fits most standard 2" to 2-1/2" flush valves'

There's a version of the kit with a different shaped handle (round) and the blue one attaches to that.