Champion M-674 Spark Plug Gaskets
Spark Plug Gasket, 18mm Copper Used on Champion Spark Plugs and Tempest with the following prefixes: REM, RHM, RHB, REB UREM, URHM, URHB and UREB.
Champion recommends periodic replacement of these gaskets at each annual inspection or after cleaning and gapping
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No to much you can say about washers. They were priced right and are good quality. Like to keep some around to replace when the Plugs are removed and re installed.