Piaggio Vespa PX,T5,Cosa,PK,ET2,ET4 Front Hub/Drum Oil Seal (Since 1982)
The Oil Seal Works in conjunction with the two other bearing inside the Hub to keep them clean and well protected from the elements.
Advice: The Oil Seal is inserted at the bottom of the hub
Comparison Part No. 177443 (PIAGGIO), SF504-1100 (LML)