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There is a page named "File:Spark plug insulator.jpeg" on Wikipedia
DescriptionSpark plug insulator.jpeg English: Dissected spark plug showing one-piece alumina insulator and core removed from metal holder. The glaze line...(1,824 × 1,368 (685 KB)) - 03:03, 4 October 2020
DescriptionSpark plug guts.jpeg English: Alumina insulator of a common modern spark plug broken open to reveal construction and contents. Date 27 September...(1,824 × 1,368 (1,003 KB)) - 03:03, 4 October 2020
