I suspect the K4407 stamped into the tank is the design of the tank itself, not the flush mechanism.
If you have a black, hollow canister and a single-piece lever I believe that is officially a single-flush system. It works as you say, a quick release is about half the water in the tank and a longer release is the full tank, but it is not the official dual-flush mechanism.
The Kohler dual-flush mechanism has a two-part handle (offering two separate flushes) and a complicated, solid canister.
(at least according to the youtube DIY videos)
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Why do people insist on making claims without looking them up first, do they really think no one will check? Proof by emphatic assertion rarely works.
Confirmation bias is real; I can find any number of articles that say so.
Victor, NY - Randallstown, MD - Yakima, WA - Stevensville, MD - Village of Hillsborough
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