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Gear Lube Drain screw with gasket for most Mercury lower units. (Also used as vent screw in 1963 and newer 35HP and larger non-racing gear cases.)
Was 10-79953T2
This is used as both drain & vent on 1974 & prior models. 1975-76 use this for vent screw and 22-67892A06 magnetic drain screw.
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