Description

The Martyr CMR04S is a zinc rudder anode set designed to help protect rudders and trim tabs from galvanic corrosion in saltwater use. Current product references describe it as a streamlined rudder anode set with hardware included, built for marine corrosion protection on exposed underwater metal surfaces.

Key Features

• Zinc sacrificial rudder / trim tab anode set
• Martyr part number: CMR04S
• Designed for saltwater use
• Approx. size: 5 in. diameter x 5/8 in. thickness
• Streamlined split-anode design
• Commonly supplied with slotted combination fasteners / hardware

Application / Compatibility
Designed for rudder and trim tab applications where a 5-inch split zinc anode is required. This is a general marine hardware fitment item rather than an engine-serial-number-specific anode, so matching by diameter, thickness, mounting style, and current installed shape is the safest way to confirm fitment.

Serial Number Fitment Notice
Please confirm fitment by comparing your existing anode’s outside diameter, thickness, and attachment style before ordering. For rudder and trim tab anodes, physical match is more important than engine model fitment since these are used across a variety of boat setups.

When This Part Needs Replacement
Replace this anode when it becomes heavily wasted, pitted, cracked, loose, or significantly reduced in size. Rudder and trim tab anodes should be checked regularly because they are designed to corrode first in order to protect more expensive underwater metal components.

Installation Notes
Install on a clean bare-metal contact surface and do not paint the anode. Current references indicate this set uses slotted screw fasteners / combination fasteners, so verify the included hardware matches your current installation before service.

Alternate / Superseded Part Numbers when applicable

• CMR04S
• CMR04
• 22-3122

Parts Desk Insight
Rudder anodes are easy to overlook because they are simple bolt-on parts, but they protect large underwater metal surfaces that stay exposed full-time. A 5-inch split anode like this is a common service item on boats that spend long periods in saltwater, and replacing it on time is much cheaper than dealing with corrosion on the rudder or trim tab itself.

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