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mercury 402 40hp lower unit question

  1. Boat Owning, Equipment and Maintenance
    Hi I have a 402 40hp 2 stroke outboard on the lower unit there is a pipe which goes down into I think the gearbox the pipe is blocked with a white powered its the clear pipe with the white piece at the base on second image I'm not sure how to unblock this, or if its a water pipe or a breather...