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So...are we any closer to getting a definitive size for this union. I'm leaning to it being 3/4 bsp. The trv is deffo 1/2 and the union is deffo bigger than 1/2 as I've tried a 1/2 nut against it and it's way smaller. I can't see it being metric size, what with the trv being imperial. Anyone agreeing with me on this??
That's what I am thinking. Try a washing machine hose on the valve to see it same threads.
One way to seal the valve is to screw the tail out of the radiator and seal the 1/2" end with blanking plug and then tighten it onto the valve. Have to redo the 1/2" joint with ptfe for into rad later though