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Well, cold weather is close. Working on my old one pipe steam system again. Found one radiator in small bathroom that surprised me by being piped like a two pipe system. The inlet valve is at top of rad. The return line has no trap. It is dripped directly into a wet return. I'm trying to move the return line so that it is hidden inside the wall. The thing that is puzzling me is that on the old line there was what appeared to be a tee in the line. When I got a closer look, it is something different. Wish I could post a picture, but can't right now. The top side of the tee has what looks like a cap that screws on. Then there is a small plug that screws into the side of the tee. The inside part of this plug appears to be a copper rod that is about one inch long that seats in the opposite side of the tee. When I tried to figure out what it is, the only thing that came to mind is that maybe it is some sort of vent that allows air to escape until steam hits it. But I don't see any vent hole. I've searched, but can't find anything like it. Can anyone please interpret my lousy description and tell me what this is and whether it is necessary in the system?