CMP CMEZ1 Zinc Pencil Anode 1/2" OD x 2" Length 3/8 UNC Marine Engine Cooling

The CMP CMEZ1 is a zinc pencil anode designed to protect marine engine cooling systems from galvanic corrosion. Pencil anodes sacrifice themselves to protect metal engine components — including heat exchangers, raw-water-cooled manifolds, and engine blocks — by acting as the preferred target for electrochemical attack in saltwater environments.

Key Features:

• Material: High-purity zinc for maximum galvanic protection
• Outside Diameter: 1/2 inch
• Length: 2 inches
• Thread Size: 3/8 UNC (threaded plug-in installation)
• Designed for saltwater use only — zinc anodes are the correct choice for salt and brackish water environments
• Fits engine cooling system anode ports on many inboard and sterndrive marine engines

Regular inspection and replacement of pencil anodes is a critical part of marine engine maintenance. A depleted or missing anode allows corrosion to attack costly engine cooling passages and heat exchanger components. CMP (Canada Metal Pacific) is a trusted manufacturer of marine-grade sacrificial anodes used worldwide by boaters and marine service professionals.