Martyr CMV18 Zinc Large Ring Anode – Volvo Penta | Replaces OEM 875815-3 | Saltwater
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Martyr CMV18 Zinc Large Ring Anode – Volvo Penta
A direct-replacement zinc large ring anode for Volvo Penta sterndrives and outdrives. This anode provides sacrificial galvanic protection for the drive unit’s lower section in saltwater. Zinc is the correct alloy for full saltwater use with consistent high salinity.
Replaces OEM part number 875815-3.
Compatible Applications
- Volvo Penta sterndrive and outdrive units requiring the large ring anode (OEM 875815-3)
- Saltwater use
- Confirm OEM part number against your drive’s service manual before ordering
Specifications
- Part Number: CMV18
- SKU: 194-CMV18
- Replaces OEM: Volvo Penta 875815-3
- Material: Military-grade zinc alloy (sacrificial)
- Style: Large ring anode
- Best For: Saltwater
- Weight: 753 g
Also Available In
- CMV18 – Aluminum (saltwater & brackish)
- CMV18 – 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 CMV18 is the large ring anode for Volvo Penta drives — one of the higher-mass anodes in the Volvo Penta lineup and an important one to replace on schedule. Ring anodes on sterndrive units are often overlooked at haulout because they’re partially obscured by the drive housing, but a depleted ring anode leaves the lower unit’s aluminum castings exposed to galvanic attack from stainless and bronze components nearby.
Zinc is the correct choice for open-ocean saltwater with consistently high salinity. If your vessel operates in brackish or mixed-salinity water — coastal inlets, estuaries, or tidal rivers — the aluminum version is the better choice, as zinc can passivate in lower-salinity conditions. For freshwater, use the magnesium version. Always confirm the 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.