Thanks for the information. I have hot water heat, typically, not hotter than 140 degrees. The couplings on my radiator are nearly the same as a 1″ coupling. I have used coupling halves before as a temporary connection, but since they are not exactly the same, I don’t feel this is the way to go.
You stated that any plumbing supply house should be able to get my parts. I will try this, but because my system was originally installed in 1932, I was hoping to find period correct fittings and valves. Any ideas?