[retiredguy123]

Originally Posted by Bill14564

My 2014 sticker lists part numbers of replacement seals for both dual-flush and single-flush parts. I understood that to mean that if I had a dual-flush mechanism I chose those part numbers and if I had a single-flush mechanism I chose the other part numbers. Perhaps we have different stickers.

By "official" I mean the complicated, solid canister system sold as a dual-flush canister that works with either two buttons on the top of the tank or a two-piece handle.

Again, I agree that the mechanism with the hollow tube canister that I have works the way you describe. Maybe you are correct and the presence of a tube indicates a dual-flush system and it was modified in subsequent years to use the solid canister and two-piece handle.

Agreed