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Mercury Outboard Head Gasket O-Ring #8573
Mercury Outboard 3.0 liter, O-Ring, 3.0 liter, O-Ring Only, Mercury Outboard #1171-9787A5, or our Number 9787, if Cap has been replaced.
Use 3 Piece (1 Upper & 2 Lower) Seal Kit #2018
OE#: 25-818573