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Probably a riser vent. There are no main vents shown on that diagram, so the riser vent will at least give the upper floor radiator some chance of getting steam… eventually.

P.P.S. - Never buy Home Depot vents.

I agree with @delcrossv but your question makes me wonder: What happened to the 8-way you added last year?

I see this topic of water treatment coming up regularly on this and other sites. As I have mentioned before unless:

1] the boiler manufacturer directs you to use a chemical or product and in the concentration they specify or:

2] you know the chemical composition of a product and understand the boiler water chemistry involved or:

3] You are a water treatment specialist:

you should not put any chemical or product in your boiler tor water treatment

Remember: cast iron and fire tube units have different water chemistry and requirements. All boilers are not the same.

I use treatment in my cast iron home heating steam boiler without issue.

I use Steamaster, but I guess that's not available anymore.

The only side effect I have had from it is erosion of the gauge glass. But I'd rather change that then a boiler.

Thanks, guys, that helps with context.

No I did not use the 'washing soda' but I might. It's been a month, not a week, but the boiler has not run much since it's still warm during the day. Which makes the "more effective if the boiler operates 24 to 48 hours" a little problematic. It's basically, run once at four or five in the morning, and then again the next morning, or the next week.

I'm learning that my house is better insulated than I thought, plus the brick veneer is thick and heavy and holds a ton of heat. I'm not complaining about that, except in the middle of summer.

At the moment, I've got everything turned off since it'll be warm again today and I've opened the windows. When it gets cold I'll run it again and watch the sight glass. If it bounces more than an inch peak-to-peak, it gets the soda. No more Mr. Nice Guy.

cheers -m