{"product_id":"martyr-anodes-1-2-dia-pencil-zn-only-cmez1","title":"Martyr Zinc Engine Pencil Anode, 1\/2\" x 2\", 3\/8-16 Thread – Replacement Zinc Only [CMEZ1]","description":"\u003cp\u003eReplacement zinc pencil anode for engine cooling systems, heat exchangers, oil coolers and aftercoolers. The CMEZ1 is the zinc only — it threads into the brass plug you already have, so you don't need to buy a new plug every time you change zincs.\u003c\/p\u003e\n\u003cp\u003ePencil zincs sacrifice themselves to protect the more valuable metals in your raw-water cooling system from galvanic corrosion. Check them regularly and replace when about half the zinc is gone. A pencil that's eaten down to nothing means your heat exchanger is the next thing being consumed.\u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Martyr Anodes\u003c\/li\u003e\n\u003cli\u003ePart number: CMEZ1\u003c\/li\u003e\n\u003cli\u003eDiameter: 1\/2\"\u003c\/li\u003e\n\u003cli\u003eLength: 2\"\u003c\/li\u003e\n\u003cli\u003eThread: 3\/8-16 UNC (threads into the plug)\u003c\/li\u003e\n\u003cli\u003eMaterial: Zinc, die-cast to US military alloy specification\u003c\/li\u003e\n\u003cli\u003eFor use in salt water\u003c\/li\u003e\n\u003cli\u003eUPC: 628309103392\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFits the brass plug from the Martyr CME1 complete pencil anode (1\/2\" x 2\", 3\/8\" NPT plug).\u003c\/li\u003e\n\u003cli\u003eNeed the plug too? Order the \u003cstrong\u003eCME1\u003c\/strong\u003e complete anode instead.\u003c\/li\u003e\n\u003cli\u003eAlways match diameter, length and thread to the pencil you're replacing — a pencil that's too long can block coolant passages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhy zinc for pencil anodes\u003c\/h4\u003e\n\u003cp\u003eZinc is the standard for engine pencil anodes and what most engine manufacturers specify. Aluminum pencils are prone to breaking off at the neck, and the broken piece can end up lodged in coolant passages.\u003c\/p\u003e\n\u003ch4\u003eInstall tips\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eClose the raw-water seacock before removing the plug.\u003c\/li\u003e\n\u003cli\u003eClean the threads on the plug and the zinc so they make good metal-to-metal contact. Don't use thread sealant or tape between the zinc and the plug — it can insulate the zinc and stop it working.\u003c\/li\u003e\n\u003cli\u003eThread the new zinc in snug, reinstall the plug, open the seacock and check for leaks after starting the engine.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Martyr Anodes","offers":[{"title":"Default Title","offer_id":50642972115119,"sku":"CMEZ1","price":3.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1680\/8011\/files\/martyranodes-cmez1-01-377x377.jpg?v=1791824415","url":"https:\/\/onboardmarinegoods.com\/products\/martyr-anodes-1-2-dia-pencil-zn-only-cmez1","provider":"OnBoard Rigging","version":"1.0","type":"link"}