Lisle 20530 10mm Spark Plug Adapter for Compression Tester Other Metalworking Supplies SK Hand Tools 34274 1/2"

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Lisle 20530 10mm Spark Plug Adapter for Compression Tester Other Metalworking Supplies SK Hand Tools 34274 1/2"The 20530 is a 10mm thread adapter. Adapts to M14X1. 25 6H Threads.?? The Lisle 20530 Spark Plug Adapter is a replacement adapter designed for 10mm spark plugs and is compatible with the Lisle Compression Tester # LST 20250. It comes with an O ring for a secure fit and accurate compression readings.??One reviewer says this fitting works perfectly when attached and provides plenty of threads to complete a test.