Name: Zinc OMC Curved Block Anode CMT-431708Z
SKU: XUN180900655
Availability: InStock

Description
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The CMT-431708Z is a curved block zinc anode designed for OMC sterndrive systems, providing essential protection against galvanic corrosion for the outdrive and surrounding underwater components.

Its curved profile is engineered to match the contour of the drive housing, ensuring proper fitment and consistent electrical contact. Manufactured from marine-grade zinc, this anode is ideal for saltwater applications, where zinc remains the preferred material for reliable corrosion protection.

Key Features

Curved block design for OMC outdrives
Marine-grade zinc construction
Protects drive housing and internal components
Contoured fit for proper mounting and contact
OEM-style direct replacement
Ideal for saltwater use

Application / Compatibility

Fits:

OMC sterndrives (various models using curved block anodes)
Cobra and similar OMC drive systems (verify fitment)

Common on:

Older OMC outdrive platforms
Saltwater-operated sterndrive boats

Serial Number Fitment Notice

Always confirm:

Drive model (OMC / Cobra variant)
Anode shape and mounting pattern
Bolt spacing and curvature match

When This Part Needs Replacement

Anode is 50% or more consumed
Uneven or accelerated corrosion
Visible corrosion on outdrive
Routine haul-out or service interval

Installation Notes

Mount to clean, bare metal surface
Ensure full contact along curved mounting surface
Do not paint the anode
Tighten securely using correct hardware
Inspect bonding system if wear is uneven

Alternate / Cross-Reference Part Numbers

Camp Company: CMT-431708Z
OMC OEM: 431708
Aluminum equivalent available for brackish/mixed water
Magnesium version available for freshwater

Parts Desk Insight

Curved block anodes are critical on OMC drives because they match the housing profilea flat anode wont provide proper contact. For boats staying strictly in saltwater, zinc remains the safest and most proven option.