Marine-grade aftermarket gearbox sacrificial anode for selected Mercury and Mariner 6 HP, 8 HP, 9.8 HP, 9.9 HP and 15 HP outboard engines.

Designed to help protect the gearbox, lower unit and underwater metal components against galvanic corrosion.

Replaces Mercury part numbers 42121A1, 42121A2 and 42121Q02.

Available in Zinc or Aluminium.

Choose Your Anode Material

Zinc Anode

Aluminium Anode

Please follow the engine manufacturer's recommendations when choosing anode material.

Fitment

Selected twin-cylinder models:

Selected standard gearbox models:

Important: The 4-stroke applications are for selected standard gearbox models only.

Mercury and Mariner used different gearbox designs across engine generations. Please confirm the original part number before ordering.

OEM part numbers are used for identification and compatibility reference only.

1 × Gearbox Anode

Supplied in your selected material:

Mounting hardware is not included unless otherwise specified.

Before ordering, please check:

If the part looks the same as yours, this does not always mean it is the correct part for your outboard.

If unsure, please contact SSI Marine with your engine model and serial number for assistance.

Please confirm compatibility with your exact Mercury / Mariner engine model, year, serial number and gearbox configuration before purchase.