Mercruiser Alpha/Bravo 55989A3 Sterndrive Base Support Magnesium Anode 33x29 mm 1/2" UNC - Osculati 43.442.12

SKU: Osculati-43.442.12

€ 14,68

1-2 weeks delivery time

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High-efficiency magnesium base support anode for MerCruiser Alpha and Bravo sterndrives, OEM reference 55989A3. Engineered for 120–160 HP models with 1/2" UNC threaded interface, this anode features 33 mm diameter and 29 mm length. Ideal for freshwater use, magnesium offers the most active galvanic protection among sacrificial anode materials, ensuring reliable corrosion control for critical lower unit components.

Description
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Osculati 43.442.12 – MerCruiser 55989A3 Alpha/Bravo Sterndrive Magnesium Base Support Anode 33×29 mm 1/2" UNC

This magnesium base support anode is a direct-fit replacement for OEM reference 55989A3, compatible with MerCruiser Alpha and Bravo sterndrive systems (120–160 HP). Designed for optimal performance in freshwater environments, magnesium offers faster electron transfer rates than zinc or aluminium, making it the most effective sacrificial metal where conductivity is low.

Technical Specifications

Item Code	43.442.12
Material	Magnesium
OEM Reference	55989A / 55989A3
Thread	1/2" UNC
Outer Diameter	33 mm
Length	29 mm
Application	MerCruiser Alpha/Bravo Sterndrives – Base Support (120–160 HP)

Key Features

OEM-compliant replacement for MerCruiser 55989A3
Constructed from magnesium – optimized for freshwater conditions
Effective corrosion protection of sterndrive base support components
Threaded 1/2" UNC connection for easy installation
Higher electrochemical activity than zinc or aluminium

Usage Notes

Magnesium anodes are strictly recommended for freshwater use. They are not suitable for saltwater or brackish water, where they may corrode too quickly or become ineffective. Inspect regularly and replace once more than 50% of the material is depleted.

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