This is the petcock packing gasket for Yamaha Scooters. It goes under the petcock lever. OEM Yamaha Part #266-24523-00-00. After years, this gasket becomes hard and flat and no longer provides a adequate seal. This is the OEM part, not a remake. 

Don't be fooled by others selling aftermarket remakes.  They don't last.

Some applications include:
U7E 72'
LB80 Chappy 75-78
LB50 Chappy 78-82

PLEASE READ AND UNDERSTAND DETAILS AND PAYMENT/SHIPPING TERMS BEFORE BUYING. THANKS.