I bought this to test the compression on a 1980 Jeep CJ7 4.2L (258). The spark plugs are approximately 14mm in diameter, measured with a digital caliper. The supposed 14mm hose just slides right into the spark plug holes leaving room for a spare. Of course, none of the "adapters" work. Maybe I just got a "bad block"; I don't know, never mind. I'm so disgusted I just threw it in the trash; I won't even waste time with a return.
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