Here's a closer shot of what you think may be a "washout port":
Seems like overkill for something that can be flipped over like this:
The red baffle is too big and only half round, so it's not a filter, but it might be an anti-slosher.
I hate those gas can nozzles (as I'm sure you do too), so I just remove them and pour into a funnel and make a mess no matter how I pour the gas.
I have a few Honda tool engines, and I think they're great! I'm a believer in both Honda and Husqvarna.