{"product_id":"martyr-cmv18a-aluminum-large-ring-anode-volvo-penta-875815-3-194-cmv18a","title":"Martyr CMV18A Aluminum Large Ring Anode – Volvo Penta | Replaces OEM 875815-3 | Saltwater \u0026 Brackish","description":"\u003ch2\u003eMartyr CMV18A Aluminum Large Ring Anode – Volvo Penta\u003c\/h2\u003e\n\u003cp\u003eA 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.\u003c\/p\u003e\n\u003cp\u003eReplaces OEM part number \u003cstrong\u003e875815-3\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVolvo Penta sterndrive and outdrive units requiring the large ring anode (OEM 875815-3)\u003c\/li\u003e\n\u003cli\u003eSaltwater and brackish water use\u003c\/li\u003e\n\u003cli\u003eCoastal, estuarine, and mixed-salinity environments\u003c\/li\u003e\n\u003cli\u003eConfirm OEM part number against your drive’s service manual before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CMV18A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 194-CMV18A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces OEM:\u003c\/strong\u003e Volvo Penta 875815-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum alloy (sacrificial)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Large ring anode\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Saltwater \u0026amp; brackish water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 290 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAlso Available In\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/martyr-cmv18-zinc-large-ring-anode-volvo-penta-875815-3-194-cmv18\"\u003eCMV18 – Zinc\u003c\/a\u003e (saltwater)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/11062243328036\"\u003eCMV18M – Magnesium\u003c\/a\u003e (freshwater)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Volvo Penta Anodes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11141290131492\"\u003eMartyr V17 Zinc Anode – Volvo Penta\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11141288591396\"\u003eMartyr 875812 Zinc Anode – Volvo Penta\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11062239985700\"\u003eMartyr CM875821Z Zinc Duo Prop Ring Anode – Volvo Penta DuoProp\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11062239821860\"\u003eMartyr CM875821A Aluminum Duo Prop Ring Anode – Volvo Penta DuoProp\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11062239887396\"\u003eMartyr CM875821M Magnesium Duo Prop Ring Anode – Volvo Penta DuoProp\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eRing 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 \u003ca href=\"\/products\/martyr-cmv18-zinc-large-ring-anode-volvo-penta-875815-3-194-cmv18\"\u003eCMV18 zinc version\u003c\/a\u003e is also suitable. For freshwater, use the \u003ca href=\"\/products\/11062243328036\"\u003eCMV18M magnesium version\u003c\/a\u003e. Always confirm OEM part number 875815-3 against your drive’s service manual before ordering.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":50999094345764,"sku":"194-CMV18A","price":28.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/194-CMV18_d1905731-982f-494d-9643-65fabcee520f.jpg?v=1782799320","url":"https:\/\/marisolmarine.com\/products\/martyr-cmv18a-aluminum-large-ring-anode-volvo-penta-875815-3-194-cmv18a","provider":"Marisol Marine Company","version":"1.0","type":"link"}