This listing is about one (1) NGK Spark Plug for MERCURY outboard engines 3.9 hp, yr. 1967-1968 and 4.0 hp, yr. 1969-1969 , which replaces OEM Part #846 75 M.
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![Spark Plug for MERCURY outboard 3.9hp, 4hp [#84675M]](https://www.dlastore.com/media/catalog/product/cache/ba670861d278867c6cf425419441a5b6/B/5/3x/B5HS_4210_3.jpg.webp)