This is the hard to find petcock base gasket for 60's, 70's Yamaha motorcycles. It goes between the petcock base and the tank. It is equivalent to Yamaha Part #168-24512-00-00. OEM retail is $16. After years, this gasket becomes flat and no longer provides a adequate seal, so when you remove your petcock, you should replace this gasket. This seal is round (O-Ring), but it forms into the groove of your petcock base.

Some applications include:
DS6 1969-1970
DS7 1972
R3 1969
R5 1970-1972
RD125 1975-1976
RD200 1976
RD250 1973-1975
RD350 1973-1975
YCS1/YCSIC 1968
YR1 1967
YR2 1968
YDS5 1967
YM2C 1967 

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