Marine-grade aftermarket gearbox trim tab sacrificial anode for selected Mercury and Mariner 25 HP, 30 HP, 40 HP, 45 HP and 50 HP outboard engines.

Suitable for selected 2-stroke and 4-stroke models using the corresponding trim tab and gearbox configuration.

Designed to help protect the lower unit against galvanic corrosion while also assisting with steering torque adjustment.

Main Product Reference: 822157T2

Available in Zinc or Aluminium.

Choose Your Anode Material

Zinc Anode

Traditional sacrificial anode material
Particularly suitable for saltwater applications
Suitable for installations using zinc anodes

Aluminium Anode

Marine-grade aluminium alloy
Suitable for saltwater and brackish water applications
Suitable for installations using aluminium anodes

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

Fitment

Mercury / Mariner 2-Stroke Outboards

30 HP

30 HP – 2-Cylinder
30 JET – 3-Cylinder

40 HP

40 HP – 2-Cylinder
40 HP – 3-Cylinder

50 HP

50 HP – 3-Cylinder

Mercury / Mariner 4-Stroke Outboards

25 HP

25 HP – Carburettor Models
Excluding SeaPro

30 HP

30 HP – Selected 4-Stroke Models
30 EFI – 3-Cylinder
Serial Number Range: 0P153500 to 0P400999 for the specified 30 EFI application

40 HP

40 HP – 3-Cylinder, 3-Carburettor
40 EFI – 3-Cylinder

50 HP

50 HP – Selected 4-Stroke Models
Excluding BigFoot Gearbox Models

Important Fitment Notes

45 HP: Included in the supplied product range, but the exact 45 HP engine application requires confirmation.
Not suitable for Mercury / Mariner BigFoot gearbox models unless independently confirmed.
Not suitable for the excluded 25 HP SeaPro application.
Compatibility depends on engine generation, serial number and gearbox configuration.

Please confirm the original trim tab part number before ordering.

Mercury / Quicksilver Part Numbers

Main Product Reference

822157T2

Additional References Requiring Verification

8221257T2
8221257C2

These additional numbers appear in the supplied product information but should not be treated as confirmed interchangeable references until checked against the original Mercury parts catalogue.

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

Product Details

Product Type: Gearbox Trim Tab Anode
Material: Zinc or Aluminium
Application: Selected Mercury / Mariner outboards
Horsepower: 25, 30, 40 and 50 HP; selected 45 HP applications require confirmation
Engine Types: 2-Stroke and 4-Stroke
Location: Gearbox / Lower Unit
Purpose: Sacrificial corrosion protection
Additional Function: Trim tab steering adjustment
Quality: Marine-grade aftermarket replacement
Quantity: 1 anode

Package Includes

1 × Gearbox Trim Tab 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
Number of cylinders
Carburettor or EFI configuration
Engine serial number
Gearbox type
Original trim tab 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.

If unsure, 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 gearbox configuration before purchase.

25–50 HP Mercury Mariner Outboard Trim Tab Anode 822157T2 – Zinc / Aluminium