Vintage Tiger What Pipe Goes Here??

hi all,
i finished servicing my bike and putting it all back together today, but cant for the life of me remember or work out what pipe was connected to this on the fuel tank?? . there are no spare pipes i can see around this area to use.
could anyone with a 955 or 885i please have a look at theirs and advise me what pipe should be connected here.
many thanks..

 

thanks triple x. im sure i took a pipe off when dismantling. but im getting old and starting to loose my marbles!