Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 18Get this manual
Corrosion Control Anode The gear case has two corrosion control anodesAnother anode is installed on the bottom of the transom bracket assemblyAn anode helps protect the outboard against galvanic corrosion by sacrificing its metal to be slowly eroded instead of the outboard metals
Flushing Cooling SystemUsing Flushing Attachment 44357 A2
When flushing, verify that area in vicinity of propeller is clear and that no person is standing nearbyto avoid possible injuryIt is recommended to remove propeller as precautionary measure1Install Quicksilver Flushing Attachment 44357A2 (or equivalent tool) on the gear housing from the FRONT side, positioning the rubber cups over the water intake openings2Connect hose [12 in12.7mm) 1.0or larger] between flushing attachment and water tap
aGear Case Anodes (2)Transom Bracket Anode