My lable fell off of this and I am not sure where it goes. Please help

 

Most of those checkvalves are on the small tubing vacuum manifold. I'm not familiar with series five non turbo. I'd say look for the checkvalve missing that goes to the double throttle diaphram. Look at a S5 vacuum diagram in the fsm or Haynes manual. To the top.

 

Look at page F1-35 of the online S5 FSM and I think it goes to the water thermo valve on the right rear of the throttle body.

 

That would be it. You have many thanks from me...