4–30 HP Mercury Mariner Outboard Square Gearbox Anode 875208 – Zinc / Aluminium

Marine-grade aftermarket square sacrificial anode for selected 4 HP, 5 HP, 6 HP, 8 HP, 9.9 HP, 10 HP, 15 HP, 20 HP, 25 HP and 30 HP Mercury / Mariner outboard engines.

Suitable for selected 2-stroke and 4-stroke models, including FourStroke, Carburettor, EFI and SeaPro applications.

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

Main Part Number: 875208

Available in Zinc or Aluminium.

Choose Your Anode Material

Zinc Anode

• Traditional sacrificial anode material

• Particularly suitable for saltwater applications

Aluminium Anode

• Marine-grade aluminium alloy

• Suitable for saltwater and brackish water applications

• Corresponds to the material of Mercury's original 875208 anode

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

Fitment – Mercury / Mariner Outboards

2-Stroke Models

Selected applications:

• 4 HP – 2-Stroke, 1999 onwards

• 5 HP – 2-Stroke, 1999 onwards

Important: Other 2-stroke applications require confirmation using the original part number.

4-Stroke Models

4 HP

• 4 HP FourStroke – selected square-anode models

• Serial number 0R000001 onwards

5 HP

• 5 HP FourStroke – selected square-anode models

• Serial number 0R000001 onwards

6 HP

• 6 HP FourStroke – selected square-anode models

• Serial number 0R411838 onwards

8 HP

• 8 HP FourStroke – 209cc

• Selected standard and BigFoot applications

• Serial number 0R042475 onwards

9.9 HP

• 9.9 HP FourStroke – 209cc

• Selected standard and BigFoot applications

• Serial number 0R042475 onwards

• Selected 9.9 EFI and ProKicker models

10 HP

• 10 HP FourStroke – 2-Cylinder Carburettor

• Serial number 0R575531 onwards

• Selected EFI models

15 HP

• 15 HP FourStroke – 2-Cylinder Carburettor

• 15 HP FourStroke – JCI

• 15 HP FourStroke EFI

• 15 HP EFI SeaPro

• Selected models from serial number 0R235949 onwards

20 HP

• 20 HP FourStroke – 2-Cylinder Carburettor

• Serial number 0R235168 to 0R833819

• 20 HP FourStroke EFI – selected later models

25 HP

• 25 HP FourStroke EFI – 3-Cylinder

• 25 HP EFI SeaPro – selected models

• Serial number 1R154758 onwards

30 HP

• 30 HP FourStroke EFI – 3-Cylinder

• Serial number 1R154758 onwards

Important Fitment Notes

Mercury / Mariner used different anode designs across engine generations.

This listing is for the square-style 875208 anode.

Some 4, 5 and 6 HP engines use a different round anode.

Compatibility depends on:

• Engine model and horsepower

• 2-stroke or 4-stroke configuration

• Engine serial number

• Gearbox and bracket arrangement

• Original anode shape and part number

Not every engine within the 4–30 HP range uses this anode.

Replaces Mercury / Quicksilver Part Numbers

• 875208 – Main product reference

• 97-875208 – Mercury / Quicksilver reference

Related aftermarket reference

• 875208Q

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

Product Details

• Product Type: Square Sacrificial Anode

• Material: Zinc or Aluminium

• Application: Mercury / Mariner Outboards

• Horsepower: Selected 4–30 HP

• Engine Types: 2-Stroke and 4-Stroke

• Engine Families: FourStroke, Carburettor, EFI, SeaPro

• Location: Lower Unit / Gearbox / Bracket Assembly, depending on model

• Purpose: Galvanic corrosion protection

• Quality: Marine-grade aftermarket replacement

• Quantity: 1 anode

Approximate Dimensions

• Length: 25.4 mm (1")

• Width: 19 mm (3/4")

• Thickness: 9.5 mm (3/8")

• Mounting Hole: 6.35 mm (1/4")

Please compare these approximate dimensions with your existing anode before ordering.

Package Includes

1 × Square Sacrificial Anode

Supplied in your selected material:

• Zinc

• Aluminium

Mounting hardware is not included unless otherwise specified.

Important Compatibility Information

Before ordering, please check:

• Exact Mercury / Mariner engine model

• Engine horsepower and stroke type

• Engine production year and serial number

• Gearbox or bracket configuration

• Original anode part number

• Existing anode shape and dimensions

• Required anode material

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

Anodes should be inspected regularly and replaced when significantly worn.

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

Why Buy From SSI Marine?

• Workshop-tested aftermarket & OEM-spec parts

• Same-day dispatch before 1 PM Monday–Friday

• Royal Mail Tracked 24

• UK stock – collection available from Leigh, Greater Manchester

• Technical support from experienced outboard specialists

Buyer Responsibility

Please confirm compatibility with your exact Mercury / Mariner engine model, serial number and anode mounting arrangement before purchase.