{"product_id":"martyr-zinc-duo-prop-ring-anode-volvo-penta-cmt-875821z","title":"Martyr Zinc Duo-Prop Ring Anode Volvo Penta CMT-875821Z","description":"\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"b22bd926-01bd-441a-a51c-35fbfbfcb815\" dir=\"auto\" data-message-model-slug=\"gpt-5-4-thinking\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word dark markdown-new-styling\"\u003e\n\u003cp data-start=\"81\" data-end=\"422\"\u003eThe Martyr CMT-875821Z is a zinc ring anode for select \u003cstrong data-start=\"162\" data-end=\"200\"\u003eVolvo Penta Duo-Prop \/ DP outdrive\u003c\/strong\u003e applications. Current supplier and manufacturer references identify it as the Martyr replacement for \u003cstrong data-start=\"302\" data-end=\"324\"\u003eVolvo Penta 875821\u003c\/strong\u003e, used as a ring-style corrosion anode on compatible drives. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"424\" data-end=\"885\"\u003eThis is a \u003cstrong data-start=\"434\" data-end=\"442\"\u003ezinc\u003c\/strong\u003e anode, which makes it the correct material choice for \u003cstrong data-start=\"497\" data-end=\"510\"\u003esaltwater\u003c\/strong\u003e use. Published dimensions from current listings are approximately \u003cstrong data-start=\"577\" data-end=\"607\"\u003e4-3\/8 in. outside diameter\u003c\/strong\u003e, \u003cstrong data-start=\"609\" data-end=\"653\"\u003e3-5\/8 in. mounting-hole center to center\u003c\/strong\u003e, with other seller references listing about \u003cstrong data-start=\"698\" data-end=\"758\"\u003e145 mm length, 29 mm height, 92 mm diameter, and 9 mm ID\u003c\/strong\u003e depending on how the part is measured. Mounting hardware is commonly listed as included. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"887\" data-end=\"905\"\u003e\u003cstrong data-start=\"887\" data-end=\"903\"\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"906\" data-end=\"1325\"\u003e\n\u003cli data-start=\"906\" data-end=\"977\"\u003eZinc sacrificial ring anode for Volvo Penta Duo-Prop \/ DP outdrives\u003c\/li\u003e\n\u003cli data-start=\"978\" data-end=\"1019\"\u003eMartyr cross reference: \u003cstrong data-start=\"1004\" data-end=\"1017\"\u003eCM875821Z\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1020\" data-end=\"1055\"\u003eReplaces \u003cstrong data-start=\"1031\" data-end=\"1053\"\u003eVolvo Penta 875821\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1056\" data-end=\"1116\"\u003eRing \/ collar style anode for drive corrosion protection\u003c\/li\u003e\n\u003cli data-start=\"1117\" data-end=\"1197\"\u003eCommon published dimensions: \u003cstrong data-start=\"1148\" data-end=\"1164\"\u003e4-3\/8 in. OD\u003c\/strong\u003e and \u003cstrong data-start=\"1169\" data-end=\"1195\"\u003e3-5\/8 in. hole centers\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1198\" data-end=\"1247\"\u003eMounting hardware commonly listed as included\u003c\/li\u003e\n\u003cli data-start=\"1248\" data-end=\"1325\"\u003eIntended for \u003cstrong data-start=\"1263\" data-end=\"1276\"\u003esaltwater\u003c\/strong\u003e protection \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1327\" data-end=\"1884\"\u003e\u003cstrong data-start=\"1327\" data-end=\"1351\"\u003eEngine Compatibility\u003c\/strong\u003e\u003cbr data-start=\"1351\" data-end=\"1354\"\u003eCommonly associated with \u003cstrong data-start=\"1379\" data-end=\"1448\"\u003eVolvo Penta 280 \/ 290 Duo Prop and DP-style outdrive applications\u003c\/strong\u003e. Seller references specifically identify it as a \u003cstrong data-start=\"1498\" data-end=\"1529\"\u003eDP outdrive ring zinc anode\u003c\/strong\u003e, while additional listings describe it for \u003cstrong data-start=\"1573\" data-end=\"1648\"\u003eVolvo Penta Duo Prop 290 series saildrive \/ outdrive-style applications\u003c\/strong\u003e. Because older Volvo Penta drive families can have overlapping service histories and replacement parts, fitment should be confirmed against your exact drive model and serial number before ordering. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1886\" data-end=\"2334\"\u003e\u003cstrong data-start=\"1886\" data-end=\"1918\"\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003cbr data-start=\"1918\" data-end=\"1921\"\u003ePlease confirm fitment using your \u003cstrong data-start=\"1955\" data-end=\"2000\"\u003eVolvo Penta drive model and serial number\u003c\/strong\u003e before ordering. This is especially important on older Duo-Prop and DP drives, where prior repairs or mixed-component service history can leave a drive wearing a different anode than expected from appearance alone. The strongest supported replacement reference found for this part is \u003cstrong data-start=\"2285\" data-end=\"2295\"\u003e875821\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2336\" data-end=\"2697\"\u003e\u003cstrong data-start=\"2336\" data-end=\"2372\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003cbr data-start=\"2372\" data-end=\"2375\"\u003eReplace this anode when it is heavily wasted, pitted, cracked, loose, or reduced enough that it is no longer providing effective sacrificial protection. Drive anodes should be inspected regularly during haul-out and service intervals, especially on boats kept in saltwater year-round. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2699\" data-end=\"3110\"\u003e\u003cstrong data-start=\"2699\" data-end=\"2721\"\u003eInstallation Notes\u003c\/strong\u003e\u003cbr data-start=\"2721\" data-end=\"2724\"\u003eInstall on a clean metal contact surface and do not paint the anode. If replacing an older worn ring anode, inspect the surrounding mounting area and hardware at the same time. Current listings commonly indicate that \u003cstrong data-start=\"2941\" data-end=\"2974\"\u003emounting hardware is included\u003c\/strong\u003e, but included contents should still be confirmed against your exact source listing when ordering. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3112\" data-end=\"3153\"\u003e\u003cstrong data-start=\"3112\" data-end=\"3151\"\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3154\" data-end=\"3222\"\u003e\n\u003cli data-start=\"3154\" data-end=\"3168\"\u003e\u003cstrong data-start=\"3156\" data-end=\"3166\"\u003e875821\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"3169\" data-end=\"3222\"\u003e\n\u003cstrong data-start=\"3171\" data-end=\"3184\"\u003eCM875821Z\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3224\" data-end=\"3682\"\u003e\u003cstrong data-start=\"3224\" data-end=\"3246\"\u003eParts Desk Insight\u003c\/strong\u003e\u003cbr data-start=\"3246\" data-end=\"3249\"\u003eRing anodes like this protect expensive drive components in an area many owners never closely inspect until corrosion has already started. Another useful detail is that this part is often grouped with older \u003cstrong data-start=\"3456\" data-end=\"3497\"\u003eVolvo Penta 280\/290 Duo-Prop families\u003c\/strong\u003e, which makes serial-number verification especially important because many of these drives have long service lives and mixed replacement histories. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3684\" data-end=\"3764\"\u003e\u003cstrong data-start=\"3684\" data-end=\"3696\"\u003eShipping\u003c\/strong\u003e\u003cbr data-start=\"3696\" data-end=\"3699\"\u003eShipping: Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"WEST","offers":[{"title":"Default Title","offer_id":43564130828324,"sku":"CMT-875821Z","price":40.71,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/CMT-875821Z.png?v=1772761127","url":"https:\/\/marisolmarine.com\/products\/martyr-zinc-duo-prop-ring-anode-volvo-penta-cmt-875821z","provider":"Marisol Marine Company","version":"1.0","type":"link"}