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Radiator cap adapter for use with 12270 tester to check 3/4" deep caps. (Both ends of adapter are 3/4" deep.) (Vehicles using the Stant 10208, 10226, 10228, 10229, 10230, 10231, 10234, 10235, 10237,10308,10328, 10329, 10330, 10331, 10334, 10335, 10337 radiator caps. No adapter is required to test the cooling systems on these vehicles.