Good work both! Nice to see the forum working as intended.
To confirm for anyone else reading this another day - the Akra fitting instructions say plain 'V-TUV050'.
I looked at the V-TUV050/3 and I have to say it looks identical, but for anyone else purchasing, I'd advise getting it on a 'sale or return' basis just in case.
And you do need the screw. I recommend stainless since it will get a fair bit of moisture in its time.