Zinc Engine Anode E1 3/8″ UNC CMT-EZ1

The CMT-EZ1 is a zinc engine anode with 3/8″ UNC thread, designed to protect internal engine cooling passages and components from galvanic corrosion. Installed directly into the engine block or heat exchanger, it acts as a sacrificial metal to prevent corrosion damage to critical internal parts.

Zinc is the preferred material for raw water cooling systems in saltwater environments, providing reliable and predictable corrosion protection.

Key Features

• 3/8″ UNC threaded engine anode (E1 style)
• Marine-grade zinc construction
• Protects engine block, heat exchanger, and cooling passages
• Designed for raw water-cooled systems
• Direct OEM-style replacement

Engine Compatibility

Commonly used in:

• Inboard marine engines
• Sterndrive engines
• Heat exchanger-equipped systems

Found in many:

• Volvo Penta
• MerCruiser
• Crusader
• PCM

(Always verify thread size and anode length for exact fitment)

Serial Number Fitment Notice

Always confirm:

• Thread size (3/8″ UNC)
• Anode length and diameter
• Engine model and serial number

Correct sizing is critical for proper protection and fit.

When This Part Needs Replacement

• Anode is 50% or more consumed
• Heavy scaling or buildup
• Reduced cooling efficiency
• Routine service interval (often every season)

Installation Notes

• Remove old anode and inspect port threads
• Install with thread sealant (if specified by OEM)
• Do not overtighten
• Inspect regularly, especially in saltwater use

Alternate / Cross-Reference Part Numbers

• Camp Company: CMT-EZ1
• Common equivalent: E1 zinc anode
• Aluminum and magnesium versions available depending on water type

Parts Desk Insight

Engine anodes are critical but often overlooked. If theyre gone, corrosion moves straight into your cooling system. For saltwater boats, checking these every season is cheap insurance against major engine damage.

Shipping

Shipping: Ships same or next day for fast Canada wide shipping.