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.

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