Aluminum Rudder Anode 4-1/2" CMR04AL 194-CMR04AL
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
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.
Key Features
- Aluminum alloy ā 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
Application / Compatibility
Ideal for:
- Sailboats and powerboats requiring rudder protection
- Vessels operating in saltwater or brackish water
- Pintles, gudgeons, and bonded rudder hardware
ā Always confirm mounting hole spacing and anode dimensions before ordering.
Serial Number Fitment Notice
- Confirm size: 4-1/2"
- Verify mounting hole spacing and bolt pattern
- Check existing anode profile matches CMR04 shape
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
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
Alternate / Cross-Reference Part Numbers
- Martyr / Camp: CMR04AL / 194-CMR04AL
- Zinc equivalent: CMR04Z
- Magnesium version available for freshwater
Parts Desk Insight
Aluminum rudder anodes are now the preferred choice for most saltwater and mixed-water applications ā 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.
Shipping
Ships in 1ā3 business days for fast Canada wide shipping. ā
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3ā4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us ā and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity ā and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.