New answers tagged steam
1-1/4 is probably the thread size on the bottom (standard pipe threads.) The threaded part that's currently exposed is the radiator union connection, and may fit a 1-1/4" union, or it may be an odd size specific to the radiator, depending on how that company was playing the game at the time. If its a 1-1/4 union thread, you'd need to buy a 1-1/4 union and ...
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