Sierra 18-6021 Zinc Anode Plug - Replaces Volvo Penta 3838500, 838928, 861546

The Sierra 18-6021 Anode Plug is a zinc sacrificial anode designed to protect Volvo Penta marine drive components from galvanic corrosion. Made from machined zinc, this small plug threads into the engine or drive housing and corrodes preferentially in place of surrounding metal parts, extending the service life of the components it protects. Zinc anodes like this one are a routine maintenance item on boats operated in saltwater and brackish water, where galvanic corrosion is an ongoing concern, and should be inspected regularly and replaced once significantly worn down.

This anode plug is a direct interchange for Volvo Penta parts 3838500, 838928, and 861546, so it installs in place of the original equipment part without modification. Sierra manufactures the 18-6021 to meet or exceed the performance of the original equipment part it replaces, and it is backed by Sierra's standard customer satisfaction warranty.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6021
• Material: Zinc
• Finish: Machined
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.13 pounds
• UPC: 030999320308
• OEM Part Number: VOLVO 838928-0
• OEM Cross Reference: Volvo Penta 3838500, 838928, 861546

Fitment

Fits applications using Volvo Penta anode plugs 3838500, 838928, and 861546.

Replaces (OEM)

• Volvo Penta 3838500
• Volvo Penta 838928
• Volvo Penta 861546

Frequently Asked Questions

What is the Sierra 18-6021 anode plug made of? The Sierra 18-6021 Anode Plug is made of zinc, a sacrificial metal that corrodes in place of surrounding engine or drive components to protect them from galvanic corrosion.

Is the Sierra 18-6021 a direct replacement for my Volvo Penta anode plug? Yes, the Sierra 18-6021 is interchangeable with Volvo Penta anode plugs 3838500, 838928, and 861546, so it installs in place of any of those original equipment part numbers.

What are the dimensions of the 18-6021 anode plug? The Sierra 18-6021 Anode Plug measures 0.39 x 0.39 x 0.39 inches.

How much does the 18-6021 anode plug weigh? It weighs 0.13 pounds.

Does the Sierra 18-6021 meet OEM performance standards? Sierra manufactures the 18-6021 Anode Plug to meet or exceed the performance of the Volvo Penta original equipment part it replaces.

Why does a Volvo Penta drive need a zinc anode plug? A zinc anode plug like the Sierra 18-6021 sacrifices itself to galvanic corrosion instead of the surrounding metal engine or drive components, which is especially important in saltwater and brackish water use.

How often should the 18-6021 anode plug be replaced? The zinc anode should be inspected periodically and replaced once it has corroded down significantly, since a depleted anode can no longer protect the surrounding drive components.

Is the Sierra 18-6021 covered under warranty? Yes, the Sierra 18-6021 Anode Plug is covered under Sierra's standard customer satisfaction warranty.

What finish does the 18-6021 anode plug have? The Sierra 18-6021 Anode Plug has a machined finish.

Is the Sierra 18-6021 an OEM or aftermarket part? The 18-6021 is a Sierra aftermarket anode plug engineered as a direct interchange for Volvo Penta parts 3838500, 838928, and 861546, built to match or exceed original equipment performance.