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Novarossi Head Gasket O-Ring
This is a replacement Novarossi Head Gasket O-Ring, and is intended for use with the Novarossi 359 Race 21, 35 Plus 21 LC/WC and Plus 21-4 engines. This is the o-ring that is installed between the head button and the case. This o-ring helps to reduce vibration to the head button.