It's a thingymajig for the dodah and Ducati will charge you the earth and take your children as deposit!
I see that on the attached image, hose 4 is a vent from the tank and can go to the bottom of the motor Hose 6 can be plugged as it goes to the TB's What happens to hose 2 though ? Can that just joint to hose 4 or is it just removed altogether ?