Help with Vevor upgrades. How to measure fittings

[Tinkers-Poitín]

I'm trying to source some bits and pieces to help me move the condenser off the top of my still and maybe replace some of the brass and I have little other option other than to order online.

What am I looking at when ordering? Thread size? Bore size?

I'm sorry if it's a stupid question. I'm not getting any joy from Google. Plumbing definitely isn't my trade so I don't know what I'm looking at and I didn't know where else to ask. I wish there was still a family owned business local to me where you can walk in with a fitting in your hand and they'd just tell you "It's a 9 by 14, you need and you'll want it bevelled" and then they charge you 24 pence.


While I'm advertising my ignorance, I might as well double check. Something like a stainless steel flexible tap connector would be appropriate for vapour wouldn't it?

Thanks in advance.