Originally Posted by Singletrack_mind
I'm pretty sure that "Ventilation valve" (PN 16117721943) which appears in both the carbon canister diagram and the fuel tank diagram is actually the same piece. It certainly bears the same part number, and I am not aware of that valve being in two places on my bike. I think it's just a question of how the parts diagrams are drawn up. The exact same tank diagram is used for the euro model, so it has to include the valve, but in the USA they add the Carbon Canister diagram and include the valve again because it's part of the system. Just a little overlap.
Exactly. There's just one valve.