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

It may be that this nut keeps the fuel tank float in place on your scooter. If not, it is used for the front luggage rack.

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