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Mercury Outboard #PT475 or 6278
Mercury Outboard V6 use number 6278
OE#: 99186T 99186, 811628, 99186-1, 99186-T
Mercury a cartridge motor & pump assembly, replaces square or round Mercury cartridge pump assemblies with side fill reservoir, 1984 - 1991,: this is the one that the dealer tells you is not available. o-ring included