I'm looking at buying a vacuum gauge, but they nearly all have BSPP
(male) threads - can anyone tell me how these are supposed to be sealed
when fitted to the BSPP female?
I've come across mention of copper crush washers and bonded washers, but
i've no idea if this is the standard technique.
Would the "crush washer" be sized to fit over the BSP thread, or inside
the female?

thanks,
graham.