Where the red part of rag is

Red rag part is stopping coolant from leaking out

The intake manifold

The red rag is plugging it
So I replaced my engine (D16Y8) because a bearing kept getting spun, and I’m hooking up the coolant hoses Busch I don’t k ow which one this connects to, from what I’ve noticed, my intake manifold is different than a few others, so the manifold that came with the new engine is different than my stock one, I apfed on using the stock one because the new one had issues with my wire harness, but I have no clue what this spout connects to, it’s on the passenger side right below the throtlle, it’s a 1996 Honda civic EX, chassis code is EK