MG Duff 806189A2 806189Q1 Mercury MerCruiser Alpha Horseshoe Anode

MG Duff CM806189 Mercury MerCruiser Alpha Horseshoe Anode – Zinc / Aluminium / Magnesium

The MG Duff CM806189 series includes horseshoe-shaped sacrificial anodes designed for compatible Mercury and MerCruiser Alpha sterndrive installations. These replacement anodes provide sacrificial corrosion protection for electrically connected underwater metallic components of the propulsion system.

Three material versions are available: zinc (CM806189Z), aluminium (CM806189A) and magnesium (CM806189M). Each version is supplied individually and is intended for installations requiring the corresponding horseshoe anode configuration.

The distinctive horseshoe-shaped construction is an important identification feature when selecting a replacement. The correct material should be selected according to the vessel's operating water conditions and the manufacturer's corrosion protection recommendations.

Technical Specifications

Available Material Variants

Mercury and MerCruiser Alpha Compatibility

The MG Duff CM806189 horseshoe anodes are listed for compatible Mercury / MerCruiser Alpha propulsion systems.

The supplied product information identifies the Alpha drive family but does not specify individual drive generations, production years, serial number ranges or original Mercury part numbers.

Before ordering, verify that the existing anode has the corresponding horseshoe configuration and check the applicable Mercury or MerCruiser parts documentation for compatibility with the specific drive.

Horseshoe Anode Construction

The CM806189 series features a horseshoe-shaped sacrificial metal body intended for the corresponding mounting position on compatible Alpha drives.

The available specifications confirm the anode type, application and material options. Overall dimensions, weight, fixing-hole spacing and mounting hardware specifications have not been provided.

Compare the original anode's shape, dimensions and mounting arrangement with the replacement component before installation.

Zinc, Aluminium and Magnesium Corrosion Protection

The MG Duff CM806189 series offers three sacrificial anode materials:

• Zinc – CM806189Z: Commonly used for galvanic corrosion protection in saltwater marine environments.
• Aluminium – CM806189A: Used in suitable marine corrosion protection systems, including saltwater and certain brackish-water conditions.
• Magnesium – CM806189M: Generally selected for freshwater corrosion protection systems.

When correctly installed with suitable electrical continuity to the metallic components requiring protection, the sacrificial anode material corrodes preferentially, helping reduce galvanic corrosion of connected underwater parts.

The appropriate material should be selected according to operating water conditions and the recommendations of the propulsion equipment manufacturer.

Inspection and Replacement

Inspect the horseshoe anode periodically during routine sterndrive maintenance. Replace it when the sacrificial material becomes significantly depleted, physically damaged or no longer securely attached.

Before installing a replacement, confirm the drive configuration, inspect the mounting and electrical contact surfaces, and verify that the horseshoe anode matches the original component.

Part Numbers and Product Identification

• MG Duff Zinc: CM806189Z
• MG Duff Aluminium: CM806189A
• MG Duff Magnesium: CM806189M
• Zinc EAN: 0628309100964
• Aluminium EAN: 0628309115388
• Magnesium EAN: 0628309100957
• Application: Mercury / MerCruiser Alpha

Scope of Supply

1 × MG Duff Mercury / MerCruiser Alpha Horseshoe Anode in the selected material:

• CM806189Z – Zinc; or
• CM806189A – Aluminium; or
• CM806189M – Magnesium.