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

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

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Martyr Aluminum Anode Kit For Volvo Penta 280 Engine (Contains 1-V18, 1-CM832598 and Fastening Hardware)

$46.19 - $46.19

$46.19

$46.19 - $46.19

$46.19

Item locally warehoused

Volvo Anode Kit - For Salt And Brackish Water Kit contents: 1 × V18 anode, 1 × CM832598 anode, and fastening hardware. Parts Desk Insights This alu...

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$46.19 - $46.19

$46.19

$46.19 - $46.19

$46.19

Martyr Aluminum Anode Kit For Volvo Penta 290 Dual Prop Engine (Contains 1-875821, 1-852835 and Fastening Hardware)

Martyr Aluminum Anode Kit – Volvo Penta 290 Dual Prop (CM290DPKITA)

$46.08 - $46.08

$46.08

$46.08 - $46.08

$46.08

Item locally warehoused

Volvo Anode Kit - For Salt And Brackish Water Kit contents: 1 × 875821 anode, 1 × 852835 anode, and fastening hardware. Parts Desk Insights This al...

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$46.08 - $46.08

$46.08

$46.08 - $46.08

$46.08

Martyr Engine Cooling System Replacement Zinc Anode (Brass Plug Not Included), 5/8" x 2"

$6.29 - $6.29

$6.29

$6.29 - $6.29

$6.29

Item locally warehoused

Zinc Pencil Only w/o Plug

$6.29 - $6.29

$6.29

$6.29 - $6.29

$6.29

Martyr 656934 (DOKA) Sea Strainer Zinc Anode

$12.06 - $12.06

$12.06

$12.06 - $12.06

$12.06

Item locally warehoused

Sea Strainer Zinc.Hole dimension is the distance between holes.

$12.06 - $12.06

$12.06

$12.06 - $12.06

$12.06

Martyr Engine Cooling System Replacement Zinc Anode (Brass Plug Not Included), 3/4" x 2"

$7.65 - $7.65

$7.65

$7.65 - $7.65

$7.65

Item locally warehoused

Zinc Pencil Only w/o Plug

$7.65 - $7.65

$7.65

$7.65 - $7.65

$7.65

Martyr Frigo-Boat Zinc Anode

$7.55 - $7.55

$7.55

$7.55 - $7.55

$7.55

Item locally warehoused

Frigoboat Anode for Frigoboat's "Keel Cooler" marine refrigeration system.Two anodes required.

$7.55 - $7.55

$7.55

$7.55 - $7.55

$7.55

Seachoice 95111 Magnesium Anode Kit For 4 Cylinder Mercury Verado

$72.34 - $72.34

$72.34

$72.34 - $72.34

$72.34

Item locally warehoused

This magnesium Seachoice Mercury Verado 4 Anode Kit provides a Mercury Verado 4 4-cylinder outboard with excellent corrosion protection and is desi...

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$72.34 - $72.34

$72.34

$72.34 - $72.34

$72.34

Martyr Aluminum Anode Kit For Volvo Penta 290 Engine (Contains 1-V18, 1-852835 and Fastening Hardware)

Martyr Aluminum Anode Kit – Volvo Penta 290 (CM290KITA)

$58.47 - $58.47

$58.47

$58.47 - $58.47

$58.47

Item locally warehoused

Martyr Aluminum Anode Kit – Volvo Penta 290Protect your Volvo Penta 290 sterndrive from galvanic corrosion with this complete aluminum anode kit. F...

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$58.47 - $58.47

$58.47

$58.47 - $58.47

$58.47

Martyr Aluminum Anode Kit For Volvo Penta 280 Dual Prop Engine (Contains 1-875821, 1-832598 and Fastening Hardware)

Martyr CM280DPKITA Aluminum Anode Kit – Volvo Penta 280 Dual Prop

$47.24 - $47.24

$47.24

$47.24 - $47.24

$47.24

Item locally warehoused

Keep your Volvo Penta 280 dual prop drive protected from corrosion with this complete aluminum anode replacement kit. Designed for salt and brackis...

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$47.24 - $47.24

$47.24

$47.24 - $47.24

$47.24

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$23.89 - $23.89

$23.89

$23.89 - $23.89

$23.89

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$23.89 - $23.89

$23.89

$23.89 - $23.89

$23.89

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$11.69 - $11.69

$11.69

$11.69 - $11.69

$11.69

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$11.69 - $11.69

$11.69

$11.69 - $11.69

$11.69

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$36.99 - $36.99

$36.99

$36.99 - $36.99

$36.99

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$36.99 - $36.99

$36.99

$36.99 - $36.99

$36.99

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$16.19 - $16.19

$16.19

$16.19 - $16.19

$16.19

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$16.19 - $16.19

$16.19

$16.19 - $16.19

$16.19

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$26.89 - $26.89

$26.89

$26.89 - $26.89

$26.89

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$26.89 - $26.89

$26.89

$26.89 - $26.89

$26.89

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$6.89 - $6.89

$6.89

$6.89 - $6.89

$6.89

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$6.89 - $6.89

$6.89

$6.89 - $6.89

$6.89

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$69.39 - $69.39

$69.39

$69.39 - $69.39

$69.39

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$69.39 - $69.39

$69.39

$69.39 - $69.39

$69.39

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$8.59 - $8.59

$8.59

$8.59 - $8.59

$8.59

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$8.59 - $8.59

$8.59

$8.59 - $8.59

$8.59

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$114.59 - $114.59

$114.59

$114.59 - $114.59

$114.59

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$114.59 - $114.59

$114.59

$114.59 - $114.59

$114.59

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$41.19 - $41.19

$41.19

$41.19 - $41.19

$41.19

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$41.19 - $41.19

$41.19

$41.19 - $41.19

$41.19

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$8.19 - $8.19

$8.19

$8.19 - $8.19

$8.19

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$8.19 - $8.19

$8.19

$8.19 - $8.19

$8.19

Seachoice 95611 Rudder & Trim Tab Anode w/Allen Screw, Magnesium, R4MG, Size 5" dia. x 5/8"

$56.99 - $56.99

$56.99

$56.99 - $56.99

$56.99

Item locally warehoused

Magnesium for fresh water only. High-quality, cadmium-free anodes Higher protection than zinc 2.5 Times lighter than zinc Corrodes less than zinc I...

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$56.99 - $56.99

$56.99

$56.99 - $56.99

$56.99

Martyr Rudder/Trim Tab Anode With Stainless Steel Allen Head

$63.39 - $63.39

$63.39

$63.39 - $63.39

$63.39

Item locally warehoused

Rudder & Trim Tab Anodes w/Allen Screw

$63.39 - $63.39

$63.39

$63.39 - $63.39

$63.39

Seachoice 95608 Rudder & Trim Tab Anode w/Allen Screw, Magnesium, Model R4, Size 3-3/4" dia. x 1/2"

$28.69 - $28.69

$28.69

$28.69 - $28.69

$28.69

Item locally warehoused

Magnesium for fresh water only. High-quality, cadmium-free anodes Higher protection than zinc 2.5 Times lighter than zinc Corrodes less than zinc I...

View full details

$28.69 - $28.69

$28.69

$28.69 - $28.69

$28.69

Martyr Bennett Trim Tab Anode Kit

$53.19 - $53.19

$53.19

$53.19 - $53.19

$53.19

Item locally warehoused

Bennett Trim Tab Anode Kit. Uses existing holes in most popular tabs. Kit includes (2) Anodes & (4) SS Screws.

$53.19 - $53.19

$53.19

$53.19 - $53.19

$53.19

Seachoice 95606 Rudder & Trim Tab Anode w/Allen Screw, Magnesium, Model R2, Size 2-13/16" dia. x 1/2"

$21.89 - $21.89

$21.89

$21.89 - $21.89

$21.89

Item locally warehoused

Magnesium for fresh water only. High-quality, cadmium-free anodes Higher protection than zinc 2.5 Times lighter than zinc Corrodes less than zinc I...

View full details

$21.89 - $21.89

$21.89

$21.89 - $21.89

$21.89

Seachoice Anode Kit, Zeus Pod Drive, Aluminum

$295.62 - $295.62

$295.62

$295.62 - $295.62

$295.62

Item locally warehoused

This Seachoice Zeus POD Drive Anode Kit includes everything needed for installation on the trim tab of a Zeus POD drive. This kit includes a pair o...

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$295.62 - $295.62

$295.62

$295.62 - $295.62

$295.62

Martyr CMBNT1AKITA Bennett trim tab anode kit

Martyr Bennett Trim Tab Anode Kit

$38.19 - $38.19

$38.19

$38.19 - $38.19

$38.19

Item locally warehoused

Martyr Bennett Trim Tab Anode Kit.

$38.19 - $38.19

$38.19

$38.19 - $38.19

$38.19

Seachoice 95607 Rudder & Trim Tab Anode w/Allen Screw, Aluminum, Model R3, Size 3-3/4" dia. x 1/2"

$19.64 - $19.64

$19.64

$19.64 - $19.64

$19.64

Item locally warehoused

Aluminum suitable for salt and brackish water. High-quality, cadmium-free anodes Higher protection than zinc 2.5 Times lighter than zinc Corrodes l...

View full details

$19.64 - $19.64

$19.64

$19.64 - $19.64

$19.64

Martyr Streamlined Shaft Zinc Anode With Stainless Steel Slotted Head

$26.13 - $26.13

$26.13

$26.13 - $26.13

$26.13

Item locally warehoused

Streamlined Shaft Anodes w/Slotted Hardware - Zinc

$26.13 - $26.13

$26.13

$26.13 - $26.13

$26.13

Martyr Streamlined Shaft Zinc Anode With Stainless Steel Slotted Head

$20.78 - $20.78

$20.78

$20.78 - $20.78

$20.78

Item locally warehoused

Streamlined Shaft Anodes w/Slotted Hardware - Zinc

$20.78 - $20.78

$20.78

$20.78 - $20.78

$20.78

Martyr Streamlined Shaft Zinc Anode With Stainless Steel Slotted Head

$140.29 - $140.29

$140.29

$140.29 - $140.29

$140.29

Item locally warehoused

Streamlined Shaft Anodes w/Slotted Hardware - Zinc

$140.29 - $140.29

$140.29

$140.29 - $140.29

$140.29

Yamaha Anode Kits - Aluminum

$53.79 - $53.79

$53.79

$53.79 - $53.79

$53.79

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes. Includes: Stainless steel fastening hardware Installation instructions All a...

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$53.79 - $53.79

$53.79

$53.79 - $53.79

$53.79

Yamaha Anode Kits - Aluminum

$52.59 - $52.59

$52.59

$52.59 - $52.59

$52.59

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes. Includes: Stainless steel fastening hardware Installation instructions All a...

View full details

$52.59 - $52.59

$52.59

$52.59 - $52.59

$52.59

Yamaha Anode Kits - Aluminum

$53.59 - $53.59

$53.59

$53.59 - $53.59

$53.59

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes. Includes: Stainless steel fastening hardware Installation instructions All a...

View full details

$53.59 - $53.59

$53.59

$53.59 - $53.59

$53.59

Trim Tab Anode - Magnesium

$34.99 - $34.99

$34.99

$34.99 - $34.99

$34.99

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes.

$34.99 - $34.99

$34.99

$34.99 - $34.99

$34.99

Martyr Pleasurecraft Propeller Nut & Anode Kit, Zinc, Series E

$122.73 - $122.73

$122.73

$122.73 - $122.73

$122.73

Item locally warehoused

Complete set, insert and hardware included.

$122.73 - $122.73

$122.73

$122.73 - $122.73

$122.73

Yamaha Anode Kits - Zinc

$50.91 - $50.91

$50.91

$50.91 - $50.91

$50.91

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes. Includes: Stainless steel fastening hardware Installation instructions All a...

View full details

$50.91 - $50.91

$50.91

$50.91 - $50.91

$50.91

Martyr Anode Kit For Yamaha 150-200 HP Outboards (Contains 1-6G54525101, 1-6J94537101 and Fastening Hardware)

$51.59 - $51.59

$51.59

$51.59 - $51.59

$51.59

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes. Includes: Stainless steel fastening hardware Installation instructions All a...

View full details

$51.59 - $51.59

$51.59

$51.59 - $51.59

$51.59

Martyr 806190 Anode For Mercury Mercruiser

$21.89 - $21.89

$21.89

$21.89 - $21.89

$21.89

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes.

$21.89 - $21.89

$21.89

$21.89 - $21.89

$21.89

Martyr 806190 Anode For Mercury Mercruiser

$22.49 - $22.49

$22.49

$22.49 - $22.49

$22.49

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes.

$22.49 - $22.49

$22.49

$22.49 - $22.49

$22.49

Martyr Pleasurecraft Propeller Nut & Anode Kit, Zinc, Series D

$98.27 - $98.27

$98.27

$98.27 - $98.27

$98.27

Item locally warehoused

Complete set, insert and hardware included.

$98.27 - $98.27

$98.27

$98.27 - $98.27

$98.27

Anode Autoprop Prop Nut H5

$42.19 - $42.19

$42.19

$42.19 - $42.19

$42.19

Item locally warehoused

Auto Prop Propeller Nut Anodes w/Nylon Inserts

$42.19 - $42.19

$42.19

$42.19 - $42.19

$42.19

Martyr PNFX Flexofold Zinc Anode

$43.99 - $43.99

$43.99

$43.99 - $43.99

$43.99

Item locally warehoused

Flex-O-Fold™ Propeller Anode

$43.99 - $43.99

$43.99

$43.99 - $43.99

$43.99

Martyr 865182C Mercruiser Enhanced Protection Prop Nut Magnesium Anode Fits Prop Shafts For Bravo III Up to 2003

$275.49 - $275.49

$275.49

$275.49 - $275.49

$275.49

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes.Aluminum for salt and brackish waterMagnesium for fresh waterZinc for salt water

$275.49 - $275.49

$275.49

$275.49 - $275.49

$275.49

Martyr Pleasurecraft Propeller Nut & Anode Kit, Zinc, Series C

$103.19 - $103.19

$103.19

$103.19 - $103.19

$103.19

Item locally warehoused

Complete set, insert and hardware included.

$103.19 - $103.19

$103.19

$103.19 - $103.19

$103.19

Martyr 865182C Mercruiser Enhanced Protection Prop Nut Aluminum Anode Fits Prop Shafts For Bravo III Up to 2003

$178.49 - $178.49

$178.49

$178.49 - $178.49

$178.49

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes.Aluminum for salt and brackish waterMagnesium for fresh waterZinc for salt water

$178.49 - $178.49

$178.49

$178.49 - $178.49

$178.49

Martyr MP70R Max Prop Zinc Anode (Includes Insert)

$21.99 - $21.99

$21.99

$21.99 - $21.99

$21.99

Item locally warehoused

Propeller Nut Anode For Max Prop - Zinc

$21.99 - $21.99

$21.99

$21.99 - $21.99

$21.99

Martyr 806189 Anode For Mercury Mercruiser

$6.81 - $6.81

$6.81

$6.81 - $6.81

$6.81

Item locally warehoused

Always check propeller clearance after installing new trim tab anodes.

$6.81 - $6.81

$6.81

$6.81 - $6.81

$6.81

Sacrificial Anodes

Shop Marine Sacrificial Anodes

Shop by Anode Category

Anodes Help Protect Underwater Metals from Corrosion

Match Water Type

Confirm Shape and Size

Use Kits When Possible

Single Anode or Complete Kit?

Sacrificial Anode Buying Help

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