Description

The CMR04AL (194-CMR04AL) is a marine-grade aluminum rudder anode sized at 4-1/2″, providing sacrificial cathodic protection for rudder assemblies, pintles, gudgeons, and underwater hardware on sailboats and powerboats. Aluminum construction delivers superior performance in saltwater and brackish environments with longer service life than zinc.

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Key Features

• Aluminum alloy — superior for saltwater and brackish water
• 4-1/2″ size fits standard rudder configurations
• Protects rudder hardware from galvanic corrosion
• Longer lifespan vs zinc equivalent (CMR04Z)
• Direct replacement for standard 4-1/2″ rudder anode applications
• Easy installation and replacement at haul-out

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Application / Compatibility

Ideal for:

• Sailboats and powerboats requiring rudder protection
• Vessels operating in saltwater or brackish water
• Pintles, gudgeons, and bonded rudder hardware

Always confirm mounting hole spacing and anode dimensions before ordering.

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Serial Number Fitment Notice

• Confirm size: 4-1/2″
• Verify mounting hole spacing and bolt pattern
• Check existing anode profile matches CMR04 shape

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When This Part Needs Replacement

• Anode is 50% or more consumed
• Heavy pitting or uneven wear
• Loss of bonding or electrical contact
• Seasonal maintenance or haul-out

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Installation Notes

• Mount to clean, bare metal surface
• Do not paint the anode surface
• Ensure proper electrical contact with rudder hardware
• Inspect bonding system if uneven wear occurs

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Alternate / Cross-Reference Part Numbers

• Martyr / Camp: CMR04AL / 194-CMR04AL
• Zinc equivalent: CMR04Z
• Magnesium version available for freshwater

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Parts Desk Insight

Aluminum rudder anodes are now the preferred choice for most saltwater and mixed-water applications — they last longer and protect more consistently than zinc. If your boat moves between fresh and salt water, aluminum is the safest all-around option.

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Shipping

Ships in 1–3 business days for fast Canada wide shipping.