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Adding additional radiators

Having done heat loss calculations, I have figured out the EDR I need. Using TLAOSH, I have calculated the risers, run-outs, valve sizes, vents, etc, that I need.  What I am not sure about, is how the new valve will attach to the new-to-me radiators (have not yet purchased, but am actively looking).

Is there a fitting that screws into the radiator that matches and attaches to the valve?   What is this piece called?  And how is it sized?  Is there anything else I should be asking?

Thank you,



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