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I've not run into one of these before. What does it do? And the "Return Flo-Tee"?

Background: I normally see all zones originate off a manifold at the boiler. Piping in this house was set up more like a branching system, with zone valves spread out in the crawl space.

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So someone zoned it after the fact?

From the size of the pipes, I think it was laid out this way originally.

And, is that lead sweat into those copper fittings?

No. Galvanized steel tubing. I've been told it was basically electrical conduit. Odd how it shows up at just the time when we started using copper drain pipes. I've never seen a problem with it, but always cautioned my clients that it's unusual.

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