Tank lids and nuts for Vespa
there are 2 products
Fuel tank cap with ring nut for Piaggio Ciao SI Bravo
code 13-DY-019-CI
technical specifications
Ref Orig 445271 adaptable to other mopeds:
"APE P50 1st Series metal tank"
Ring nut for mm. 33 to 48 mm
compatibility
Piaggio Hi, YES, Bravo