Martyr CM832598M Magnesium Transom Plate Anode – Volvo Penta 280/290
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Martyr Magnesium Transom Plate Anode — Volvo Penta 280/290
Replace the transom plate anode on your Volvo Penta 280 or 290 sterndrive with this magnesium formulation from Martyr Anodes. Designed to match OEM dimensions and mounting points, this anode protects the transom plate and surrounding hardware from galvanic corrosion — the primary cause of premature metal loss on sterndrives operating in corrosive water conditions.
Magnesium anodes are the correct choice for freshwater use, where zinc and aluminum alloys are too noble to provide effective protection. If you operate in saltwater or brackish water, see the zinc and aluminum alternatives linked below.
Part Information
- Part Number: CM832598M
- Brand: Martyr Anodes
- Anode Material: Magnesium
- Anode Type: Transom Plate Anode
- OEM Reference: 832598
- Best Use: Freshwater environments
Compatible Applications
- Volvo Penta 280 Sterndrive
- Volvo Penta 290 Sterndrive
Choosing the Right Alloy
- Magnesium (this part) — Freshwater use only
- Aluminum — CM832598A — Saltwater and brackish water
- Zinc — CMT-832598Z — Saltwater use
Parts Desk Insights
The most common mistake with transom plate anodes is choosing the wrong alloy for the water type. Magnesium anodes are specifically formulated for freshwater — using them in saltwater will cause them to deplete far too quickly and leave your drive unprotected between service intervals. If you’re unsure which alloy is right for your water conditions, aluminum is the most versatile option for mixed or brackish environments. Replace transom plate anodes annually or whenever they’ve depleted to roughly 50% of their original size — whichever comes first.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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 — 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 — 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.