The CMT-EZ1H is a zinc engine anode (E1H style) with 3/8″ UNC thread, designed to protect internal engine cooling systems from galvanic corrosion. Installed directly into the engine block or heat exchanger, it acts as a sacrificial elementcorroding first to protect critical internal components.

This version is typically supplied as a pencil anode only (no brass plug), making it a direct replacement for worn anodes in existing housings.

Key Features

E1H style engine anode
3/8″ UNC thread (anode-only replacement)
Marine-grade zinc construction
Protects engine cooling passages and heat exchangers
Designed for saltwater applications
Direct replacement for existing pencil anode systems

Application / Compatibility

Designed for:

Inboard marine engines
Heat exchanger systems
Raw water-cooled engines

Common on:

Volvo Penta
MerCruiser
Yanmar
Crusader

Used where anode-only replacement is required (existing plug reused)

Serial Number / Fitment Notice

Always confirm:

Thread size (3/8″ UNC)
Anode length and diameter
Whether your system uses anode-only vs complete plug assembly

Correct fitment is critical for proper protection.

When This Part Needs Replacement

Anode is 50% or more consumed
Heavy scaling or deterioration
Reduced cooling efficiency
Routine seasonal maintenance

Installation Notes

Remove old anode from existing plug
Clean threads and inspect housing
Install new anode securely
Do not overtighten
Inspect regularly in saltwater use

Alternate / Cross-Reference Part Numbers

Camp Company: CMT-EZ1H
Martyr: CMEZ1H
Common reference: E-1H zinc anode
Complete assembly version: E1H (with brass plug)

Parts Desk Insight

The H version is usually the replacement-only zinc, meaning you reuse your existing brass plug. Its a cost-effective way to maintain protectionjust make sure the plug itself is still in good condition.