Air Bellow Frame - connects Air Filter Box and Frame, protects against coarse dirt.
The Air Bellow on the Frame connects the Air Filter Box to the Frame. The air is sucked in via the Frame so that coarse dirt does not even get into the Air Filter Box. Over time, the Rubber becomes porous and brittle and should then be replaced.
Intake rubbers are available for all Vespa models; most versions come from Italian manufacturers
SIP-TIP:
When replacing the intake rubber, it is best to also replace the Air Filter and the Carburettor Casing Cap Gasket. The LML Air Filter additionally filters the air and is attached to the Frame.