12021 cap adapter is required to test small diameter (45mm O.D.) radiator caps (Stant 10227, 10327, 10233 and 10333) as used on many late model Toyota, Nissan, Subaru, Mitsubishi and Honda cars.

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12021 cap adapter is required to test small diameter (45mm O.D.) radiator caps (Stant 10227, 10327, 10233 and 10333) as used on many late model Toyota, Nissan, Subaru, Mitsubishi and Honda cars.

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