Thanks for the heads up, John, but i think i'll stick with my real UP90 Shires siphon...
I was able to find one some time ago in a UK shop after s long journey of endless email inquiries.
Unfortunately not the one with these small fins at the tube end but otherwise accurate.
But since i'm convinced that not all siphons were the same... i'm fine with mine!
Ahhhhmmm, i might overthink this, i really like these little, tiny, small fins a lot....