Original Vespa / Piaggio - Self-locking Nut M6 - Sprint / Primavera / GTS / 946 - 709116

The fuel float on your scooter may be held in place by this nut. If not, it's used for the front luggage rack.

Either way, if it comes loose, you'll have problems. So only install this original self-locking nut, and it'll be secure!