Sierra 18-6125M Magnesium Anode Transom Plate for Volvo Penta

The Sierra 18-6125M is a magnesium transom plate anode built for Volvo Penta applications. As a sacrificial anode, it is designed to corrode in place of more critical underwater metal components, protecting the drive and transom hardware from galvanic corrosion caused by electrolysis in the water. Magnesium anodes like this one are the standard choice for boats operated in fresh water, where magnesium's higher activity provides better protection than zinc.

Installed on the transom plate of a Volvo Penta setup, this anode should be inspected periodically and replaced once it has worn down significantly, which helps prevent corrosion damage from reaching the drive unit, transom assembly, and other submerged metal parts. Regular anode replacement is one of the simplest and most cost-effective forms of preventive maintenance for a boat running a Volvo Penta drive.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6125M
• Material: Magnesium
• Application: Volvo Penta transom plate
• Weight: 0.71 pounds

Frequently Asked Questions

What is the Sierra 18-6125M? The Sierra 18-6125M is a magnesium anode designed for the transom plate on Volvo Penta applications, used to provide sacrificial corrosion protection.

What material is the 18-6125M anode made from? It is made from magnesium, which is commonly preferred over zinc for boats operated primarily in fresh water.

How much does the 18-6125M anode weigh? The Sierra 18-6125M weighs 0.71 pounds.

What does a transom plate anode do? A transom plate anode like the Sierra 18-6125M corrodes sacrificially in place of the metal components on the drive and transom, protecting them from galvanic corrosion.

Is the 18-6125M made by Sierra? Yes, part number 18-6125M is manufactured by Sierra.

What application is the 18-6125M anode intended for? The Sierra 18-6125M is intended for the transom plate on Volvo Penta applications.

Why choose a magnesium anode instead of zinc? Magnesium anodes such as the Sierra 18-6125M are more active than zinc, making them better suited to fresh water use where zinc anodes can passivate and stop protecting effectively.

How do I know when to replace the 18-6125M anode? The Sierra 18-6125M should be replaced once it has visibly worn down, since a depleted anode can no longer provide effective sacrificial corrosion protection.

Where is the 18-6125M anode installed? The Sierra 18-6125M mounts on the transom plate of a Volvo Penta setup.

Is the Sierra 18-6125M a genuine Sierra part? Yes, 18-6125M is a genuine Sierra part number, not an aftermarket equivalent.