Martyr CMV18A Aluminum Large Ring Anode – Volvo Penta | Replaces OEM 875815-3 | Saltwater & Brackish
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Martyr CMV18A Aluminum Large Ring Anode – Volvo Penta
A direct-replacement aluminum large ring anode for Volvo Penta sterndrives and outdrives. Aluminum is the preferred sacrificial metal for saltwater and brackish water environments — it remains electrochemically active across a wider salinity range than zinc, making it the better choice wherever water salinity varies or drops below full oceanic levels.
Replaces OEM part number 875815-3.
Compatible Applications
- Volvo Penta sterndrive and outdrive units requiring the large ring anode (OEM 875815-3)
- Saltwater and brackish water use
- Coastal, estuarine, and mixed-salinity environments
- Confirm OEM part number against your drive’s service manual before ordering
Specifications
- Part Number: CMV18A
- SKU: 194-CMV18A
- Replaces OEM: Volvo Penta 875815-3
- Material: Aluminum alloy (sacrificial)
- Style: Large ring anode
- Best For: Saltwater & brackish water
- Weight: 290 g
Also Available In
- CMV18 – Zinc (saltwater)
- CMV18M – Magnesium (freshwater)
Related Volvo Penta Anodes
- Martyr V17 Zinc Anode – Volvo Penta
- Martyr 875812 Zinc Anode – Volvo Penta
- Martyr CM875821Z Zinc Duo Prop Ring Anode – Volvo Penta DuoProp
- Martyr CM875821A Aluminum Duo Prop Ring Anode – Volvo Penta DuoProp
- Martyr CM875821M Magnesium Duo Prop Ring Anode – Volvo Penta DuoProp
Parts Desk Insights
The CMV18A is the best choice for the Volvo Penta large ring anode position in saltwater and brackish conditions. Aluminum outperforms zinc in mixed or lower-salinity water because zinc can passivate — forming a surface layer that stops it from sacrificing properly — while aluminum stays active. If your vessel operates in a coastal inlet, estuary, or any water where salinity fluctuates, aluminum is the safer pick over zinc.
Ring anodes on sterndrive units are often overlooked at haulout because they’re partially obscured by the drive housing — make a point of inspecting and replacing this anode at every haulout. For open-ocean saltwater with consistently high salinity, the CMV18 zinc version is also suitable. For freshwater, use the CMV18M magnesium version. Always confirm OEM part number 875815-3 against your drive’s service manual before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.