{"product_id":"zinc-anode-plug-for-volvo-penta-aq-md-series-replaces-oem-838928-sierra-18-6021","title":"Sierra 18-6021 Zinc Anode Plug - Replaces Volvo Penta 3838500, 838928, 861546","description":"\u003cp\u003eThe Sierra 18-6021 Anode Plug is a zinc sacrificial anode designed to protect Volvo Penta marine drive components from galvanic corrosion. Made from machined zinc, this small plug threads into the engine or drive housing and corrodes preferentially in place of surrounding metal parts, extending the service life of the components it protects. Zinc anodes like this one are a routine maintenance item on boats operated in saltwater and brackish water, where galvanic corrosion is an ongoing concern, and should be inspected regularly and replaced once significantly worn down.\u003c\/p\u003e\u003cp\u003eThis anode plug is a direct interchange for Volvo Penta parts 3838500, 838928, and 861546, so it installs in place of the original equipment part without modification. Sierra manufactures the 18-6021 to meet or exceed the performance of the original equipment part it replaces, and it is backed by Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-6021\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Zinc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999320308\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e VOLVO 838928-0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Volvo Penta 3838500, 838928, 861546\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications using Volvo Penta anode plugs 3838500, 838928, and 861546.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVolvo Penta 3838500\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 838928\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 861546\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-6021 anode plug made of?\u003c\/strong\u003e The Sierra 18-6021 Anode Plug is made of zinc, a sacrificial metal that corrodes in place of surrounding engine or drive components to protect them from galvanic corrosion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6021 a direct replacement for my Volvo Penta anode plug?\u003c\/strong\u003e Yes, the Sierra 18-6021 is interchangeable with Volvo Penta anode plugs 3838500, 838928, and 861546, so it installs in place of any of those original equipment part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-6021 anode plug?\u003c\/strong\u003e The Sierra 18-6021 Anode Plug measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-6021 anode plug weigh?\u003c\/strong\u003e It weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-6021 meet OEM performance standards?\u003c\/strong\u003e Sierra manufactures the 18-6021 Anode Plug to meet or exceed the performance of the Volvo Penta original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a Volvo Penta drive need a zinc anode plug?\u003c\/strong\u003e A zinc anode plug like the Sierra 18-6021 sacrifices itself to galvanic corrosion instead of the surrounding metal engine or drive components, which is especially important in saltwater and brackish water use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow often should the 18-6021 anode plug be replaced?\u003c\/strong\u003e The zinc anode should be inspected periodically and replaced once it has corroded down significantly, since a depleted anode can no longer protect the surrounding drive components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6021 covered under warranty?\u003c\/strong\u003e Yes, the Sierra 18-6021 Anode Plug is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-6021 anode plug have?\u003c\/strong\u003e The Sierra 18-6021 Anode Plug has a machined finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6021 an OEM or aftermarket part?\u003c\/strong\u003e The 18-6021 is a Sierra aftermarket anode plug engineered as a direct interchange for Volvo Penta parts 3838500, 838928, and 861546, built to match or exceed original equipment performance.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988349137115,"sku":"SIE-18-6021","price":16.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-6021_lg__30716.1558129566.500.750.jpg?v=1785188551","url":"https:\/\/www.goodvibesmarina.com\/products\/zinc-anode-plug-for-volvo-penta-aq-md-series-replaces-oem-838928-sierra-18-6021","provider":"Good Vibes Marina","version":"1.0","type":"link"}