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Someone recently sent me some photos of several radiators and asked if they could be used for two-pipe. Although I'd seen one or two of these in the past, I never gave it much thought. They are obviously hot water style, but with these odd featureless covers (?) where you'd expect to find a plug at the top. Although strangely star-shaped, there are plugs on the bottom, but what's the deal with the top? is there some kind of flush plug under the flat piece, or what?