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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.

Shop Sacrificial Anodes Zinc Anodes Anode Kits
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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Zinc Hull Plate Anode 4-5/8" x 2-1/2" CMT-ZHC2AZ

$61.32 - $61.32
$61.32
$61.32
$61.32 - $61.32
$61.32
Only 1 left!

The CMT-ZHC2AZ (Martyr CMZHC2AZ) is a compact bolt-on zinc hull plate anode designed to protect underwater hull surfaces and bonded metal component...

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$61.32 - $61.32
$61.32
$61.32
$61.32 - $61.32
$61.32

Zinc Hull Plate Anode 6-1/4" x 2-3/4" CMT-ZHC3AZ

$58.95 - $58.95
$58.95
$58.95
$58.95 - $58.95
$58.95
in stock

The CMT-ZHC3AZ (Martyr CMZHC3AZ) is a bolt-on zinc hull plate anode designed to protect underwater hull surfaces from galvanic corrosion. Installed...

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$58.95 - $58.95
$58.95
$58.95
$58.95 - $58.95
$58.95

Yamaha Zinc Crankcase Anode 68V-11325-02-00

$40.39 - $40.39
$40.39
$40.39
$40.39 - $40.39
$40.39
Only 1 left!

The Yamaha 68V-11325-02-00 is a genuine OEM zinc crankcase anode designed to protect internal engine components from galvanic corrosion. Installed ...

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$40.39 - $40.39
$40.39
$40.39
$40.39 - $40.39
$40.39

Yamaha Magnesium Anode 6AW-1132P-00-00

$49.26 - $49.26
$49.26
$49.26
$49.26 - $49.26
$49.26
Only 2 left!

The Yamaha 6AW-1132P-00-00 is a genuine OEM internal engine anode (often referred to as “Anode 5”) designed to protect cylinder head and crankcase ...

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$49.26 - $49.26
$49.26
$49.26
$49.26 - $49.26
$49.26

Yamaha Zinc Crankcase Anode 6G8-11325-00-00

$5.49 - $5.49
$5.49
$5.49
$5.49 - $5.49
$5.49
Only 2 left!

The Yamaha 6G8-11325-00-00 is a genuine OEM zinc crankcase anode designed to protect internal engine components from galvanic corrosion. Instal...

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$5.49 - $5.49
$5.49
$5.49
$5.49 - $5.49
$5.49

Bennett Trim Tab Aluminum Anode Kit A 194-CMBNT1AA

$35.49 - $35.49
$35.49
$35.49
$35.49 - $35.49
$35.49
Only 1 left!

The 194-CMBNT1AA (commonly referenced as CMBNT1AKITA kit A) is an aluminum trim tab anode kit designed specifically for Bennett trim tab systems. T...

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$35.49 - $35.49
$35.49
$35.49
$35.49 - $35.49
$35.49

Yamaha Zinc Crankcase Anode 63P-11325-01-00

$18.60 - $18.60
$18.60
$18.60
$18.60 - $18.60
$18.60
Only 3 left!

The Yamaha 63P-11325-01-00 is a genuine OEM zinc anode designed to protect Yamaha outboard engines from galvanic corrosion. Commonly used as a cran...

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$18.60 - $18.60
$18.60
$18.60
$18.60 - $18.60
$18.60

Volvo Penta Aluminum Anode Kit 23164609

$83.00 - $83.00
$83.00
$83.00
$83.00 - $83.00
$83.00
Only 4 left!

The Volvo Penta 23164609 is a genuine OEM aluminum anode kit engineered to protect Volvo Penta drive systems and underwater components from galvani...

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$83.00 - $83.00
$83.00
$83.00
$83.00 - $83.00
$83.00

Volvo Penta Aluminum Anode Kit 23615636

$102.00 - $102.00
$102.00
$102.00
$102.00 - $102.00
$102.00
Only 3 left!

The Volvo Penta 23615636 is a genuine OEM aluminum anode kit designed for 130 and 150 series saildrives, providing corrosion protection for the low...

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$102.00 - $102.00
$102.00
$102.00
$102.00 - $102.00
$102.00

Volvo Penta Zinc Anode Kit 3588748

$0.00 - $0.00
$0.00
$107.00
$107.00 - $107.00
$107.00
Only 3 left!

The Volvo Penta 3588748 is a zinc anode kit designed for DPH and DPR duo-prop sterndrives, providing essential corrosion protection for the drive u...

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$0.00 - $0.00
$0.00
$107.00
$107.00 - $107.00
$107.00

Volvo Penta Zinc Anode Kit 3593981

$159.00 - $159.00
$159.00
$159.00
$159.00 - $159.00
$159.00
Only 2 left!

The Volvo Penta 3593981 is a genuine OEM zinc anode kit designed for IPS (Inboard Performance System) drives, providing critical corrosion protecti...

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$159.00 - $159.00
$159.00
$159.00
$159.00 - $159.00
$159.00

Volvo Penta Zinc Anode 838929

$20.20 - $20.20
$20.20
$20.20
$20.20 - $20.20
$20.20
Only 3 left!

The Volvo Penta 838929 is a zinc pencil anode designed to protect internal engine cooling system components from galvanic corrosion. Installed insi...

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$20.20 - $20.20
$20.20
$20.20
$20.20 - $20.20
$20.20

ZN Hanging Anode 11' Cable

$153.07 - $153.07
$153.07
$153.07
$153.07 - $153.07
$153.07
Only 3 left!

This fish-shaped zinc anode is a portable overboard sacrificial anode designed to provide temporary corrosion protection for boats at dock or ancho...

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$153.07 - $153.07
$153.07
$153.07
$153.07 - $153.07
$153.07

MerCruiser Bravo 3 Zinc Prop Nut Anode CMT-865182CZ

$13.08 - $13.08
$13.08
$13.08
$13.08 - $13.08
$13.08
in stock

The CMT-865182CZ is a zinc prop nut anode designed specifically for MerCruiser Bravo 3 sterndrives (2004 and newer), providing dual-function propel...

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$13.08 - $13.08
$13.08
$13.08
$13.08 - $13.08
$13.08

Zinc Engine Anode E0 5/16" UNC CMT-EZ0

$4.44 - $4.44
$4.44
$4.44
$4.44 - $4.44
$4.44
in stock

The CMT-EZ0 is a marine-grade zinc pencil engine anode, E0 style with 5/16" UNC thread, providing sacrificial cathodic protection for internal engi...

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$4.44 - $4.44
$4.44
$4.44
$4.44 - $4.44
$4.44

Zinc Shaft Anode 4" CMT-X17

$162.56 - $162.56
$162.56
$162.56
$162.56 - $162.56
$162.56
Only 3 left!

The CMT-X17 is a marine-grade zinc clamp-on shaft anode sized for 4" diameter propeller shafts, providing heavy-duty sacrificial cathodic protectio...

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$162.56 - $162.56
$162.56
$162.56
$162.56 - $162.56
$162.56

Sierra Zinc Trim Tab Anode SIE-23-6401 Mercury Mariner

$34.82 - $34.82
$34.82
$34.82
$34.82 - $34.82
$34.82
Only 3 left!

The Sierra 23-6401 (SIE-23-6401) is a marine-grade zinc trim tab anode designed as a direct aftermarket replacement for Mercury and Mariner outboar...

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$34.82 - $34.82
$34.82
$34.82
$34.82 - $34.82
$34.82

Yanmar OEM Internal Engine Anode 120650-13420

$28.16 - $28.16
$28.16
$28.16 - $28.16
$28.16
Only 3 left!

The Yanmar 120650-13420 is a genuine OEM sacrificial anode designed for Yanmar marine diesel engines, providing cathodic protection for internal co...

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$28.16 - $28.16
$28.16
$28.16 - $28.16
$28.16

Volvo Penta Aluminum Pencil Engine Anode – CM838929A (Replaces 838929 / 194)

$4.49 - $4.49
$4.49
$4.49
$4.49 - $4.49
$4.49
Only 4 left!

The CM838929A is a marine-grade aluminum pencil anode designed to protect internal engine cooling passages from galvanic corrosion. Installed insid...

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$4.49 - $4.49
$4.49
$4.49
$4.49 - $4.49
$4.49
Sold out

Aluminum Rudder Anode 3-3/4" CMR03AL 194-CMR03AL

$15.63 - $15.63
$15.63
$15.63
$15.63 - $15.63
$15.63
Out of stock

The CMR03AL (194-CMR03AL) is a marine-grade aluminum rudder anode sized at 3-3/4", providing sacrificial cathodic protection for rudder assemblies,...

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$15.63 - $15.63
$15.63
$15.63
$15.63 - $15.63
$15.63
Sold out

Aluminum Rudder Anode 4-1/2" CMR04AL 194-CMR04AL

$31.07 - $31.07
$31.07
$31.07
$31.07 - $31.07
$31.07
in stock

The CMR04AL (194-CMR04AL) is a marine-grade aluminum rudder anode sized at 4-1/2", providing sacrificial cathodic protection for rudder assemblies,...

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$31.07 - $31.07
$31.07
$31.07
$31.07 - $31.07
$31.07

Mercury OEM Aluminum Anode Kit 818298Q1 MerCruiser Alpha One

$43.56 - $43.56
$43.56
$43.56
$43.56 - $43.56
$43.56
Only 3 left!

The Mercury / Quicksilver 818298Q1 is a genuine OEM complete aluminum anode kit designed for MerCruiser Alpha One sterndrives, replacing all factor...

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$43.56 - $43.56
$43.56
$43.56
$43.56 - $43.56
$43.56

Mercury OEM Aluminum Trim Tab Anode 826134Q (Pack of 3)

$28.27 - $28.27
$28.27
$28.27
$28.27 - $28.27
$28.27
Only 4 left!

The Mercury / Quicksilver 826134Q is a genuine OEM aluminum trim tab anode sold in a pack of 3, designed to provide sacrificial cathodic protection...

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$28.27 - $28.27
$28.27
$28.27
$28.27 - $28.27
$28.27

Mercury OEM Aluminum Anode 893404

$44.94 - $44.94
$44.94
$44.94
$44.94 - $44.94
$44.94
Only 4 left!

Genuine Mercury OEM aluminum anode (893404) providing sacrificial cathodic protection for Mercury outboard and MerCruiser sterndrive trim tabs and ...

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$44.94 - $44.94
$44.94
$44.94
$44.94 - $44.94
$44.94

Aluminum Hanging Anode 11ft Cable CMT-GROUPERA

$98.15 - $98.15
$98.15
$98.15
$98.15 - $98.15
$98.15
Only 2 left!

Marine-grade aluminum hanging anode (CMT-GROUPERA) with 11-foot cable providing supplemental sacrificial cathodic protection for docked or moored v...

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$98.15 - $98.15
$98.15
$98.15
$98.15 - $98.15
$98.15

Zinc OMC Block Anode CMT-393023Z

$17.38 - $17.38
$17.38
$17.38
$17.38 - $17.38
$17.38
Only 4 left!

The CMT-393023Z is a zinc block anode designed for OMC, Johnson, and Evinrude outboard and sterndrive gearcases, providing essential protection aga...

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$17.38 - $17.38
$17.38
$17.38
$17.38 - $17.38
$17.38

Zinc OMC Curved Block Anode CMT-431708Z

$20.19 - $20.19
$20.19
$20.19
$20.19 - $20.19
$20.19
Only 4 left!

The CMT-431708Z is a curved block zinc anode designed for OMC sterndrive systems, providing essential protection against galvanic corrosion for the...

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$20.19 - $20.19
$20.19
$20.19
$20.19 - $20.19
$20.19

Mercury Verado Pro Series Aluminum Anode Kit CMT-8M0116590KITA

$114.91 - $114.91
$114.91
$114.91
$114.91 - $114.91
$114.91
in stock

The CMT-8M0116590KITA is a complete aluminum anode kit designed for Mercury Verado Pro Series L6 350–400HP outboards, replacing all factory-install...

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$114.91 - $114.91
$114.91
$114.91
$114.91 - $114.91
$114.91

Zinc Engine Anode E2 7/16" UNC CMT-EZ2

$7.23 - $7.23
$7.23
$7.23
$7.23 - $7.23
$7.23
in stock

The CMT-EZ2 is a zinc pencil engine anode (E-2 type) with 7/16"-14 UNC thread, designed to protect internal engine cooling passages from galvanic c...

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$7.23 - $7.23
$7.23
$7.23
$7.23 - $7.23
$7.23

Reliance X-40 Hull Zinc Anode

$41.88 - $41.88
$41.88
$41.88
$41.88 - $41.88
$41.88
Only 5 left!

The Reliance X-40 is a zinc hull anode designed for bolt-on installation, providing reliable sacrificial corrosion protection for boat hulls and bo...

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$41.88 - $41.88
$41.88
$41.88
$41.88 - $41.88
$41.88

Zinc OMC Block Anode CMT-984547Z

$76.45 - $76.45
$76.45
$76.45
$76.45 - $76.45
$76.45
Only 5 left!

The CMT-984547Z is a zinc block anode designed for OMC Cobra sterndrives, providing sacrificial corrosion protection for the transom, gimbal plate,...

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$76.45 - $76.45
$76.45
$76.45
$76.45 - $76.45
$76.45

Zinc Rudder Anode 5" CMT-R04

$48.00 - $48.00
$48.00
$48.00
$48.00 - $48.00
$48.00
in stock

The CMT-R04 is a 5" zinc rudder anode (R-4 style) designed to protect rudders and trim tabs from galvanic corrosion in saltwater environments. This...

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$48.00 - $48.00
$48.00
$48.00
$48.00 - $48.00
$48.00

Zinc Rudder Anode 5-1/8" CMT-R05

$74.13 - $74.13
$74.13
$74.13
$74.13 - $74.13
$74.13
Only 4 left!

The CMT-R05 is a 5-1/8" zinc rudder anode (R-5 style) designed to protect rudders and trim tabs from galvanic corrosion in saltwater environments. ...

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$74.13 - $74.13
$74.13
$74.13
$74.13 - $74.13
$74.13

Yamaha Internal Engine Anode 6E5-11325-00-00

$9.85 - $9.85
$9.85
$9.85
$9.85 - $9.85
$9.85
in stock

The Yamaha 6E5-11325-00-00 is a genuine OEM internal zinc engine anode designed to protect internal engine components such as the cylinder head, cr...

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$9.85 - $9.85
$9.85
$9.85
$9.85 - $9.85
$9.85

Yamaha Internal Engine Anode 6P3-11325-00-00

$22.21 - $22.21
$22.21
$22.21
$22.21 - $22.21
$22.21
in stock

The Yamaha 6P3-11325-00-00 is a genuine OEM internal zinc engine anode designed to protect critical internal engine components such as the cylinder...

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$22.21 - $22.21
$22.21
$22.21
$22.21 - $22.21
$22.21

Zinc Shaft Anode MDX-5 1-1/4"

$21.40 - $21.40
$21.40
$21.40
$21.40 - $21.40
$21.40
in stock

The MDX-5 is a zinc shaft anode designed for 1-1/4" propeller shafts, providing essential sacrificial protection for inboard running gear. Installe...

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$21.40 - $21.40
$21.40
$21.40
$21.40 - $21.40
$21.40

Zinc Engine Anode E3 1/2" UNC CMT-EZ3

$8.97 - $8.97
$8.97
$8.97
$8.97 - $8.97
$8.97
in stock

The CMT-EZ3 is a zinc engine anode (E3 style) with 1/2" UNC thread, designed to protect internal engine cooling systems from galvanic corrosion. In...

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$8.97 - $8.97
$8.97
$8.97
$8.97 - $8.97
$8.97

Zinc Engine Anode E4 1/2" UNC CMT-EZ4

$12.27 - $12.27
$12.27
$12.27
$12.27 - $12.27
$12.27
in stock

The CMT-EZ4 is a zinc engine anode (E4 style) with 1/2" UNC thread, designed to protect internal engine cooling systems from galvanic corrosion. In...

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$12.27 - $12.27
$12.27
$12.27
$12.27 - $12.27
$12.27

Zinc Shaft Anode MDX-7 1-1/2"

$21.66 - $21.66
$21.66
$21.66
$21.66 - $21.66
$21.66
in stock

The MDX-7 is a sacrificial zinc shaft-style anode designed to protect outboard and inboard drivetrain components from galvanic corrosion. Installed...

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$21.66 - $21.66
$21.66
$21.66
$21.66 - $21.66
$21.66

Yamaha Zinc Internal Engine Anode 67F-11325-01-00

$22.78 - $22.78
$22.78
$22.78
$22.78 - $22.78
$22.78
in stock

The Yamaha 67F-11325-01-00 is a genuine OEM internal zinc engine anode designed to protect critical internal components such as the cylinder head a...

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$22.78 - $22.78
$22.78
$22.78
$22.78 - $22.78
$22.78

Yamaha Internal Anode Grommet 67F-11328-01-00

$3.16 - $3.16
$3.16
$3.16
$3.16 - $3.16
$3.16
in stock

Yamaha OEM Grommet, Anode 67F-11328-01-00 Price not available•See merchants Price not available•See merchants Yamaha I...

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$3.16 - $3.16
$3.16
$3.16
$3.16 - $3.16
$3.16
Sold out

Zinc Engine Anode E1H 3/8" UNC CMT-EZ1H

$4.91 - $4.91
$4.91
$4.91
$4.91 - $4.91
$4.91
Out of stock

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. ...

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$4.91 - $4.91
$4.91
$4.91
$4.91 - $4.91
$4.91
Sold out

Zinc Rudder Anode 1-7/8" CMT-R01

$9.44 - $9.44
$9.44
$9.44
$9.44 - $9.44
$9.44
Only 5 left!

The CMT-R01 is a 1-7/8" round zinc rudder anode designed to protect rudders and trim tabs from galvanic corrosion. This two-piece “pancake” style a...

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$9.44 - $9.44
$9.44
$9.44
$9.44 - $9.44
$9.44

Aluminum Side Power Propeller Anode CMT-SGSP626A

$1.92 - $1.92
$1.92
$19.17
$19.17 - $19.17
$19.17
in stock

The CMT-SGSP626A is a marine-grade aluminum propeller anode designed specifically for Side-Power (Sleipner) thruster propeller systems. Mounted dir...

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$1.92 - $1.92
$1.92
$19.17
$19.17 - $19.17
$19.17

Yamaha Engine Anode 68V-11325-01-00

$43.13 - $43.13
$43.13
$43.13
$43.13 - $43.13
$43.13
in stock

The Yamaha 68V-11325-01-00 is a genuine OEM internal engine anode designed to protect critical engine components from galvanic corrosion. Installed...

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$43.13 - $43.13
$43.13
$43.13
$43.13 - $43.13
$43.13

Yamaha Anode 6AW-1132L-00-00

$22.66 - $22.66
$22.66
$22.66
$22.66 - $22.66
$22.66
in stock

The Yamaha 6AW-1132L-00-00 is a genuine OEM internal engine anode designed to protect critical internal components from galvanic corrosion. Install...

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$22.66 - $22.66
$22.66
$22.66
$22.66 - $22.66
$22.66

Zinc Engine Anode E1 3/8" UNC CMT-EZ1

$5.63 - $5.63
$5.63
$5.63
$5.63 - $5.63
$5.63
Only 5 left!

The CMT-EZ1 is a zinc engine anode with 3/8" UNC thread, designed to protect internal engine cooling passages and components from galvanic corrosio...

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$5.63 - $5.63
$5.63
$5.63
$5.63 - $5.63
$5.63

Zinc Rudder Anode 3-3/4" 64157

$27.17 - $27.17
$27.17
$27.17
$27.17 - $27.17
$27.17
in stock

The 64157 is a 3-3/4" zinc rudder anode designed to protect rudders and associated underwater hardware from galvanic corrosion. This two-piece (cla...

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$27.17 - $27.17
$27.17
$27.17
$27.17 - $27.17
$27.17