MGDUFF is a UK specialist in marine cathodic protection and sacrificial anodes for boats, yachts, commercial vessels, and other marine applications. MGDUFF anodes are designed to protect submerged metal components from galvanic corrosion and are available for hulls, shafts, propellers, engines, sterndrives, saildrives, thrusters, and other underwater equipment.
The MGDUFF range includes zinc, aluminium, and magnesium anodes manufactured in the UK for different water environments and marine installations. Zinc anodes are used primarily in salt water, aluminium anodes are suitable for salt and brackish water, and magnesium anodes are intended for fresh water applications.
MGDUFF cathodic protection products include individual sacrificial anodes, replacement anodes for engines and propulsion systems, hull anodes, shaft and propeller anodes, and other components used to protect underwater metalwork. Products are available in different sizes, materials, and mounting configurations to suit both recreational and commercial vessels.
At Yacht-Supply24.com, we supply MGDUFF anodes and can assist with product identification, material selection, dimensions, OEM cross-references, and finding the correct replacement for an existing cathodic protection system.
Send us your request if you need help identifying the correct MGDUFF anode or compatible replacement.
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1-2 weeks delivery time The MG Duff CM822157C2Z is a zinc skeg trim tab sacrificial anode for compatible Mercury F25, F30, F40 and F50 outboard motors manufactured from 1998 onwards, corresponding to Mercury OEM part number 822157T2. Designed for Mercury 30–50 HP applications as listed, the anode measures 93 mm in outside diameter and 82 mm in height, weighs 0.48 kg and features one fixing hole with a specified 8 mm stud size. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic outboard components in suitable saltwater environments. Supplied individually. Verify the original anode shape and mounting hardware specification before ordering. |
$ 21.73
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1-2 weeks delivery time The MG Duff CM31640Z and CM31640M are standard skeg trim tab sacrificial anodes for compatible Mercury outboard, MerCruiser Alpha One Generation I and Honda applications, with Mercury OEM references 31640T4 and 31640Q4. Listed applications include Mercury 50 HP outboards. Both variants measure 92 mm in outside diameter and 84 mm in height, feature one fixing hole with a 7/16-14 UNC mounting thread specification and have a stated bolt length of 1 3/4 inches. The zinc CM31640Z weighs 0.55 kg and is intended for saltwater applications, while the magnesium CM31640M weighs 0.14 kg and is intended for freshwater applications. Verify the original trim tab configuration and mounting hardware before ordering. |
$ 20.22
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1-2 weeks delivery time The MG Duff CM61A4537100Z is a zinc skeg trim tab sacrificial anode designed for compatible Yamaha outboard motors. Intended for saltwater corrosion protection, the anode measures 99 mm in outside diameter and 91 mm in height, features an M10 × 1.25 mounting thread and weighs 0.63 kg. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components of the outboard propulsion system. Supplied individually. Verify the original trim tab shape, mounting dimensions and Yamaha engine compatibility before ordering. |
$ 39.50
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1-2 weeks delivery time The MG Duff CM6J94537101Z is a zinc skeg trim tab sacrificial anode designed for compatible Yamaha outboard motors. Intended for saltwater applications, the anode measures 100 mm in outside diameter and 85 mm in height, features an M10 × 1.25 mounting thread and weighs 0.52 kg. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components of the outboard propulsion system. Supplied individually. Verify the original trim tab configuration, mounting thread and Yamaha engine compatibility before ordering. |
$ 30.75
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1-2 weeks delivery time The MG Duff CM6E54537101Z is a zinc skeg trim tab sacrificial anode designed for compatible Yamaha 150–200 HP outboard motors. Intended for saltwater corrosion protection, the anode measures 92 mm in outside diameter and 76 mm in height, features an M10 × 1.25 mounting thread and weighs 0.42 kg. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components of the outboard propulsion system. Verify the original trim tab configuration, engine compatibility and mounting thread before ordering. |
$ 76.15
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1-2 weeks delivery time The MG Duff CM69L4537100Z is a zinc skeg trim tab sacrificial anode designed for compatible Yamaha 200, 225, 250 and 300 HP outboard motors. Intended for saltwater applications, the anode measures 99 mm in outside diameter and 91 mm in height, features an M10 × 1.25 mounting thread and weighs 0.52 kg. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components of the outboard propulsion system. Verify the original trim tab shape, mounting thread and specific Yamaha engine model before ordering. |
$ 56.60
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1-2 weeks delivery time The MG Duff CM6H14525102Z is a zinc standard skeg sacrificial anode for compatible Yamaha 60, 70, 75, 80, 90 and 100 HP outboard motors, with additional listed applications for Parsun and ALLPASS engines. Designed for saltwater corrosion protection, the anode measures 203 mm in body length, 36 mm in width and 17 mm in height. It features two fixing holes spaced 101 mm between centres, a specified 6 mm stud size and a weight of 0.49 kg. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components. Verify the original anode dimensions, mounting arrangement and engine compatibility before ordering. |
$ 24.26
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1-2 weeks delivery time The MG Duff CM433580Z is a zinc transom bar sacrificial anode for compatible Bombardier, Johnson and Evinrude outboard motors in the 60–300 HP range equipped with power trim and tilt systems. Designed for corrosion protection of electrically connected underwater metallic components, the anode measures 175 mm in length, 34 mm in width and 21 mm in height, and weighs 0.68 kg. Its zinc construction is suitable for saltwater marine applications. Verify the original transom anode, engine model and mounting configuration before ordering. |
$ 38.77
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1-2 weeks delivery time The MG Duff CM3855411Z and CM3855411A are forward cavitation plate / transom plate sacrificial anodes for compatible Volvo Penta SX sterndrives, corresponding to Volvo Penta OEM part number 3855411. Both variants measure 145 mm in length, 103 mm in width and 37 mm in height, with two fixing holes positioned on 113 mm centres and a specified 1/4-20 UNC stud thread. The zinc CM3855411Z weighs 1.04 kg and is intended for saltwater corrosion protection, while the aluminium CM3855411A weighs 0.41 kg and is suitable for saltwater and brackish-water applications. These anodes help protect electrically connected underwater metallic drive components against galvanic corrosion. Verify the original anode dimensions and mounting arrangement before ordering. |
$ 64.12
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1-2 weeks delivery time The MG Duff CM872793A is an aluminium hook-up fork triangle sacrificial anode for compatible Volvo Penta SX, DPX and XDP-B sterndrives, corresponding to Volvo Penta part number 3861583A. Additional legacy application references include Volvo Penta 290 and 290DP. The anode measures 66 mm in length, 38 mm in width and 13 mm in height, weighs 0.05 kg and features one 6 mm diameter fixing hole with a specified 5 mm stud size. Its aluminium construction provides sacrificial galvanic corrosion protection for electrically connected metallic drive components in suitable saltwater and brackish-water environments. Verify the original anode shape, mounting arrangement and sterndrive compatibility before ordering. |
$ 13.25
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1-2 weeks delivery time The MG Duff CM61N4525101Z is a zinc trim tab sacrificial anode for compatible Yamaha 8, 9.9, 13, 25 and 60 HP outboard motors, with additional listed applications for Parsun, ALLPASS, Hidea, Tiger, Painier and ShenFeng engines. Designed for saltwater corrosion protection, the anode measures 80 mm in body length, 59 mm in width and 26 mm in height, with one fixing hole, a specified 5 mm stud size and a weight of 0.26 kg. Its zinc construction provides sacrificial galvanic corrosion protection for electrically connected underwater metallic outboard components. Verify the original trim tab dimensions, mounting arrangement and engine compatibility before ordering. |
$ 46.92
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1-2 weeks delivery time The MG Duff CM826134Z and CM826134A are sacrificial wedge anodes designed for installation on the side of the gear housing, just above the cavitation plate, on compatible Mercury outboard, MerCruiser and Honda applications. Listed fitments include Mercury Verado 6-cylinder, Honda 75 HP and references to V6, 40, 50 and 115 EFI four-stroke models. Both versions measure 76 × 30 × 23 mm, with one recessed fixing hole of 6 mm diameter and a specified 5 mm stud size. The zinc CM826134Z weighs 0.25 kg, while the aluminium CM826134A weighs 0.10 kg. Two anodes are required per assembly, but each is sold individually. Verify the exact engine and gearcase compatibility before ordering. |
$ 18.32
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1-2 weeks delivery time The MG Duff CM19644002660Z is a zinc sacrificial anode for compatible Yanmar Saildrive 20, 30, 40, 50 and 60 series installations without an adapter ring, corresponding to Yanmar part number 196420-02652. The anode measures 148 mm in length, 107 mm in width and 26 mm in height, weighs 0.85 kg and features four fixing holes with specified centre measurements of 73 mm and 42 mm and a 6 mm stud size. It provides sacrificial corrosion protection for electrically connected underwater metallic Saildrive components and is supplied individually. Verify the exact Saildrive model, original part number and mounting arrangement before ordering. |
$ 86.32
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1-2 weeks delivery time The MG Duff CM983494Z is a zinc horseshoe sacrificial anode for the upper gear case of compatible OMC, Bombardier, Johnson and Evinrude 90 HP outboard applications. The anode measures 146 mm in length, 104 mm in width and 25 mm in height, with a weight of 0.680 kg. Its horseshoe configuration is intended for the corresponding upper gear case mounting position, providing sacrificial galvanic corrosion protection for electrically connected underwater metallic components in suitable saltwater environments. Supplied individually under MG Duff part number CM983494Z, EAN 0628309101497. Verify the original anode shape, mounting arrangement and engine compatibility before ordering. |
$ 40.57
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1-2 weeks delivery time The MG Duff Multifit Zinc Anodes are designed to provide sacrificial corrosion protection for Max Prop propeller hubs in three-blade configurations. Manufactured from zinc, the range includes three models for hub sizes Ø63, Ø70 and Ø83 mm. The anodes feature a round shape and differ in their dimensional specifications: CMMP63RZ (A: 60 mm, D: 43.3 mm), CMMP70RZ (A: 68 mm, D: 50.2 mm) and CMMP83RZ (A: 80 mm, D: 56.3 mm). Each model is supplied individually. Select the appropriate anode according to the Max Prop hub size and specified dimensions. |
$ 37.59
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What is MGDUFF known for?
MGDUFF specializes in marine cathodic protection systems and sacrificial anodes for boats, yachts, commercial vessels, and other marine applications.
Its product range includes anodes for hulls, shafts, propellers, engines, sterndrives, saildrives, thrusters, and other submerged metal components.
What types of MGDUFF anodes are available?
MGDUFF manufactures zinc, aluminium, and magnesium sacrificial anodes in a wide range of shapes, sizes, and mounting configurations.
The range includes hull anodes, shaft and propeller anodes, engine and drive anodes, and replacement products for many common marine applications.
What is the difference between MGDUFF zinc, aluminium, and magnesium anodes?
MGDUFF zinc anodes are primarily used in salt water, while aluminium anodes are suitable for salt and brackish water. Magnesium anodes are intended for fresh water applications.
The correct material should be selected according to the water environment and the equipment being protected.
Where are MGDUFF anodes manufactured?
MGDUFF manufactures its sacrificial anodes in the United Kingdom. The company produces zinc, aluminium, and magnesium anodes for recreational, commercial, and professional marine applications.
Can MGDUFF anodes be used as replacements for original equipment anodes?
Yes. Many MGDUFF products are designed as replacement anodes for engines, sterndrives, saildrives, propellers, shafts, and other marine equipment.
The correct replacement can often be identified using the original part number, equipment model, dimensions, shape, and mounting arrangement.
How can I choose the correct MGDUFF cathodic protection anode?
Selection should consider the type of water, material being protected, vessel or equipment type, anode dimensions, mounting method, and existing cathodic protection arrangement.
For hull applications, vessel size and wetted surface area may also influence the number and size of anodes required.
When should MGDUFF anodes be replaced?
MGDUFF recommends regular inspection of sacrificial anodes and replacement when they are more than approximately 50% consumed.
Actual wear rate depends on water conditions, vessel use, electrical continuity, surrounding metals, and the installed anode material.
How can I identify the correct MGDUFF replacement anode?
Useful information includes the MGDUFF or OEM part number, equipment manufacturer and model, anode dimensions, mounting-hole spacing, material, and photographs of the existing component.
These details help distinguish between similar MGDUFF anodes and confirm the correct replacement.