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This is the 52mm 'O' ring that goes between the carburettor and the plastic or metal carb top elbow.
It is made from a rubber that is resistant to petrol and oil and we have sourced one that is slightly thicker than the original part so to provide a slightly better fit and seal, especially with the after market metal elbows.
Note: This 'O' ring IS included in the RTOC 32DIS carb kit.