Replica air cooled spark plug with 7/8 thread for early model motors and includes sealing washers brass terminal and brass removable terminal nuts. Fits all 7/8 applications. Includes top ventilated brass collar for cooling as original Doering design! Terminal nut is removable. Original globe design of the 1930's. Features a #3 heat range. Packaged in a gift box. *NOTE: 7/8 spark plugs fit 1923 and ealier singles and twins 1924-1947 use 18mm plugs. Best for Pre-1925 JD & F models. Doering plugs feature a nickel plated base with cooling holes as original design for air cooled engines. *NOTE: Sold as a pair. **NOTE: Air cooled spark plug features a full seize hex. Full size hex is for single and twin flat heads For IOE types with space for the large hex. *NOTE: Hex size may interfere on some Flathead models. Doering Spark Plug Company was founded in Brooklyn NY in 1918 making plugs for tractors. In the later years they made plugs for automotive applications for motors that burned an excessive amount of oil. They are manufactured to the original standards of that era but not in Brooklyn any longer.
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