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Sacrificial Anodes

Marine Sacrificial Anodes & Corrosion Protection

Shop Marine Sacrificial Anodes

Find zinc anodes, aluminum anodes, magnesium anodes, anode kits, shaft anodes, trim tab anodes, engine anodes, outdrive anodes, propeller anodes, and installation hardware for corrosion protection in saltwater, brackish water, and freshwater applications.

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Material Guide

Match anode material to your water type, then confirm dimensions, mounting style, and exact application.

Read Corrosion Protection Guide

Always confirm anode material, dimensions, fastener style, and application for your vessel, drive, engine, shaft, or underwater hardware.

Volvo Penta Mercury / MerCruiser Yanmar Crusader Indmar PCM Shaft Anodes Trim Tab Anodes Outdrive Anodes Propeller Anodes Engine Anodes

Top OEM Anode Searches

Volvo Penta Mercury / MerCruiser Yanmar Crusader Indmar PCM

Highlighted Anode Categories

Zinc AnodesCommon saltwater protection Aluminum AnodesSaltwater and brackish use Magnesium AnodesFreshwater applications Anode KitsMatched service sets Shaft AnodesProp shaft protection Trim Tab AnodesTabs and planes Engine AnodesCooling-system protection Outdrive AnodesSterndrive protection Propeller AnodesProp and hub protection

Browse Fast

Shop by Anode Category

Choose the anode material, kit, or application that matches your water type and the metal component you need to protect.

All Sacrificial Anodes Zinc Anodes Aluminum Anodes Magnesium Anodes Anode Kits Shaft Anodes Installation Hardware

Why It Matters

Anodes Help Protect Underwater Metals from Corrosion

Sacrificial anodes are designed to corrode before more valuable underwater metals such as shafts, propellers, trim tabs, outdrives, thru-hulls, and engine cooling components.

Using the correct anode material and replacing anodes before they are fully consumed helps reduce galvanic corrosion and supports longer component life.

H2O

Match Water Type

Zinc is commonly used for saltwater, aluminum can work in saltwater and brackish water, and magnesium is typically used for freshwater applications.

FIT

Confirm Shape and Size

Check diameter, length, hole spacing, thread, mounting hardware, contact surface, and whether the anode fits a shaft, tab, drive, engine, or propeller.

KIT

Use Kits When Possible

Anode kits help replace multiple matched pieces on a drive or engine at the same time, reducing missed parts during seasonal service.

Parts Desk Guidance

Single Anode or Complete Kit?

If one anode is damaged, missing, or consumed faster than the rest, a single replacement may be enough. For seasonal service or unknown history, a complete anode kit can be the better choice because it refreshes all key protection points together.

Choose zinc anodes For many saltwater applications where zinc is specified by the manufacturer or existing setup.
Choose aluminum anodes For many saltwater and brackish applications, especially where aluminum anodes are specified for drives or kits.
Choose magnesium anodes For freshwater applications where magnesium is required and saltwater exposure is not expected.
Choose anode kits For matched replacement sets on outdrives, engines, trim systems, thrusters, or other grouped applications.

Common Questions

Sacrificial Anode Buying Help

How do I choose the correct anode material?

Start with the water type and manufacturer recommendation. Zinc is often used in saltwater, aluminum is common for saltwater or brackish use, and magnesium is typically for freshwater.

When should sacrificial anodes be replaced?

Replace anodes when they are heavily wasted, loose, damaged, missing, or near half consumed. Inspect them regularly and during seasonal service.

Can I mix zinc, aluminum, and magnesium anodes?

Avoid mixing anode materials on the same bonded system unless the manufacturer specifically allows it. Mixed materials can reduce protection or cause uneven performance.

Why do anode dimensions matter?

Anodes need solid metal-to-metal contact and the correct mounting shape. Wrong dimensions, paint, loose fasteners, or poor contact can prevent proper protection.

Ready to Find Your Part?

Search Zinc, Aluminum, Magnesium Anodes & Kits

Use the collection page or search by water type, brand, application, kit, drive model, shaft size, or existing part number.

Shop All Anodes Corrosion Guide Volvo Penta Mercury / MerCruiser Yanmar Crusader Indmar PCM

Filters

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Mercury Verado 6 Zinc Manifold Anode - CMT-880653Z

$30.74 - $30.74
$30.74
$30.74
$30.74 - $30.74
$30.74
Only 4 left!

The CMT-880653Z is a zinc manifold anode designed for Mercury Verado 6-cylinder outboards. It is a direct replacement for Mercury OEM part 880653 a...

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$30.74 - $30.74
$30.74
$30.74
$30.74 - $30.74
$30.74

Mercury Alpha One Zinc Anode CMT-821631Z

$44.82 - $44.82
$44.82
$44.82
$44.82 - $44.82
$44.82
Only 5 left!

The CMT-821631Z is a zinc gimbal/block anode designed for Mercury Alpha One sterndrives, protecting the gimbal housing, transom plate, and surround...

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$44.82 - $44.82
$44.82
$44.82
$44.82 - $44.82
$44.82

Mercury Gen 2 Zinc Horseshoe Anode - CMT-806190Z

$41.55 - $41.55
$41.55
$41.55
$41.55 - $41.55
$41.55
Only 4 left!

Genuine Mercury zinc horseshoe anode designed specifically for Gen 2 outdrives. This sacrificial anode provides essential corrosion protection for ...

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$41.55 - $41.55
$41.55
$41.55
$41.55 - $41.55
$41.55

Mercury Gen 2 Aluminum Horseshoe Anode - CMT-806190A

$17.10 - $17.10
$17.10
$17.10
$17.10 - $17.10
$17.10
Only 4 left!

Genuine Mercury aluminum horseshoe anode designed specifically for Gen 2 outdrives. This sacrificial anode provides essential corrosion protection ...

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$17.10 - $17.10
$17.10
$17.10
$17.10 - $17.10
$17.10

Martyr Aluminum Horseshoe Anode Mercury Gen 2 Outdrive CMT-806189A

$6.95 - $6.95
$6.95
$6.95
$6.95 - $6.95
$6.95
Only 2 left!

The Martyr CMT-806189A is an aluminum horseshoe-style anode designed for select Mercury MerCruiser Gen 2 sterndrive applications. It is commonly de...

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$6.95 - $6.95
$6.95
$6.95
$6.95 - $6.95
$6.95

MerCruiser Bravo 2 Zinc Sterndrive Anode CMT-806188Z

$36.81 - $36.81
$36.81
$36.81
$36.81 - $36.81
$36.81
in stock

The CMT-806188Z is a marine-grade zinc sterndrive anode designed specifically for MerCruiser Bravo 2 outdrives, providing sacrificial cathodic prot...

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$36.81 - $36.81
$36.81
$36.81
$36.81 - $36.81
$36.81

West Marine Aluminum Anode for Mercury Alpha 1 - Part 514

$14.56 - $14.56
$14.56
$14.56
$14.56 - $14.56
$14.56
in stock

High-quality aluminum anode designed specifically for Mercury Alpha 1 sterndrive systems. This sacrificial anode provides essential corrosion prote...

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$14.56 - $14.56
$14.56
$14.56
$14.56 - $14.56
$14.56

Mercury Zinc Anode - CMT-762145Z (Replaces 76214)

$19.07 - $19.07
$19.07
$19.07
$19.07 - $19.07
$19.07
Only 3 left!

Genuine Mercury zinc anode designed to provide essential corrosion protection for your marine engine or outdrive. This sacrificial anode protects c...

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$19.07 - $19.07
$19.07
$19.07
$19.07 - $19.07
$19.07

Mercury Zinc Trim Tab Anode Flat CMT-762144Z

$17.72 - $17.72
$17.72
$17.72
$17.72 - $17.72
$17.72
Only 5 left!

The CMT-762144Z is a flat zinc trim tab anode designed for Mercury and MerCruiser sterndrives, providing sacrificial corrosion protection for the a...

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$17.72 - $17.72
$17.72
$17.72
$17.72 - $17.72
$17.72

Mercury Zinc Button Anode - CMT-55989Z

$7.70 - $7.70
$7.70
$7.70
$7.70 - $7.70
$7.70
in stock

Genuine Mercury zinc button anode designed to provide essential corrosion protection for your marine engine or outdrive. This compact button-style ...

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$7.70 - $7.70
$7.70
$7.70
$7.70 - $7.70
$7.70

Volvo Penta SX Transom Plate Zinc Anode CMT-3855411Z

$61.54 - $61.54
$61.54
$61.54
$61.54 - $61.54
$61.54
in stock

The CMT-3855411Z is a zinc transom (cavitation) plate anode designed specifically for Volvo Penta SX and DP-SM sterndrives. Mounted on the transom/...

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$61.54 - $61.54
$61.54
$61.54
$61.54 - $61.54
$61.54

Volvo Penta SX Gimbal Plate Zinc Anode CMT-3854130Z

$47.90 - $47.90
$47.90
$47.90
$47.90 - $47.90
$47.90
in stock

The CMT-3854130Z is a zinc gimbal (transom) plate anode designed for Volvo Penta SX and DP-SM sterndrives. Mounted directly to the gimbal/transom p...

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$47.90 - $47.90
$47.90
$47.90
$47.90 - $47.90
$47.90

Volvo Penta SX Gimbal Plate Aluminum Anode CMT-3854130A

$38.23 - $38.23
$38.23
$38.23
$38.23 - $38.23
$38.23
in stock

The CMT-3854130A is an aluminum gimbal (transom) plate anode designed for Volvo Penta SX and DP-SM sterndrives. Mounted to the gimbal/transom plate...

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$38.23 - $38.23
$38.23
$38.23
$38.23 - $38.23
$38.23

Volvo Penta OEM Anode Kit 21868042 Part 243

$161.00 - $161.00
$161.00
$161.00
$161.00 - $161.00
$161.00
in stock

Volvo Penta 21868042 is a genuine OEM aluminum anode kit designed to protect D4 and D6 engines with DPH, DPR, and DPI drives from galvanic corrosio...

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$161.00 - $161.00
$161.00
$161.00
$161.00 - $161.00
$161.00