Engine, sterndrive, and outboard anodes are designed to protect submerged metal components from galvanic corrosion through sacrificial cathodic protection. They are used on marine engines, sterndrives, outboard lower units, propellers, trim tabs, and related underwater hardware where exposed metals require protection in saltwater, brackish water, or freshwater. Anodes are available individually or as complete kits, with different shapes, mounting configurations, and materials selected to match the specific engine or drive system.
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1-2 weeks delivery time The Tecnoseal 00900 is a zinc waffle bar sacrificial anode for OMC 40–50 HP marine engines, replacing original OEM part number 976669. It measures 193 mm in length, 43 mm in width and 17 mm in height, with 177 mm mounting hole spacing and 7 mm mounting hole diameter. Weighing 0.45 kg (0.99 lbs), the anode features a curved profile with two mounting points and provides sacrificial corrosion protection for compatible engine components.
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$ 58.15
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1-2 weeks delivery time The Tecnoseal 00901 is a zinc waffle exhaust sacrificial anode for OMC 100–245 HP marine engines, corresponding to original OEM part number 982277. It measures 117 mm in length, 80 mm in width and 38 mm in overall height, with 101 mm mounting hole spacing and 7 mm mounting hole diameter. Weighing 0.58 kg (1.28 lbs), the anode features a rectangular waffle-pattern body with four mounting holes and provides sacrificial corrosion protection for compatible OMC engine components.
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$ 79.78
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1-2 weeks delivery time The Tecnoseal 00902 is a zinc sacrificial housing anode designed for OMC Stringer Drive systems, corresponding to original OEM part number 982438. It measures 185 mm in overall length, 80 mm in width and 38 mm in height, with a longitudinal mounting hole spacing of 101 mm and 7 mm mounting hole diameter. Weighing 0.97 kg (2.14 lbs), the anode features a shaped rectangular body with a waffle-pattern structure and four mounting holes, providing sacrificial corrosion protection for compatible drive housing components.
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$ 106.23
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1-2 weeks delivery time The Tecnoseal OMC Cobra Front Gearcase Anode is a sacrificial anode designed for the front gearcase of OMC Cobra sterndrives, corresponding to OEM part numbers 984513 and 3853818. Available in zinc (00903), aluminium (00903AL) and magnesium (00903MG), all three versions measure 145 × 100 × 25 mm, with an internal dimension of 113 mm and 1/4" UNC mounting threads. The zinc version weighs 1.04 kg, the aluminium version 0.39 kg and the magnesium version 0.25 kg. Each version provides sacrificial corrosion protection for the compatible drive housing.
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$ 92.46
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1-2 weeks delivery time The Tecnoseal 00904 is a zinc sacrificial gimbal plate anode designed for OMC Cobra 130–385 HP sterndrive systems, corresponding to original OEM part numbers 983952 and 984547. It measures 118 mm in overall length, 109 mm in width and 48 mm in height, with an additional length dimension (l1) of 87 mm, mounting hole spacing (i) of 56 mm and hole diameters of 20 mm and 11 mm. Weighing 1.27 kg (2.80 lbs), the anode features a shaped rectangular body with two mounting holes and recessed sections for installation on compatible OMC Cobra gimbal assemblies.
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$ 100.84
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1-2 weeks delivery time The Tecnoseal 00905 is a zinc sacrificial trim tab anode designed for Johnson-Evinrude 55 HP marine engines, corresponding to original OEM part number 338742. It features a circular anode body with an integrated vertical trim fin, measuring 130 mm in overall dimension (a), 60 mm in height (h) and 13 mm in lower height (h1). The circular section has a diameter of 110 mm, with mounting diameters of 18 mm and 11 mm. Weighing 0.44 kg (0.97 lbs), the anode provides sacrificial corrosion protection for compatible Johnson-Evinrude engine components.
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$ 52.47
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1-2 weeks delivery time The Tecnoseal OMC Horseshoe Front Gearcase Anode is designed for OMC Cobra 90 HP sterndrives and corresponds to original OEM part number 983494. Available in zinc (00906), aluminium (00906AL) and magnesium (00906MG), the anode features a horseshoe-shaped profile measuring 145 × 104 × 25 mm, with an internal dimension (i) of 113 mm and 1/4" UNC mounting threads. The zinc version weighs 0.75 kg (1.65 lbs), the aluminium version 0.29 kg (0.64 lbs) and the magnesium version 0.18 kg (0.40 lbs). All three versions share the same dimensions and provide sacrificial corrosion protection for the OMC Cobra front gearcase.
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$ 76.49
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Gearcase Anode is a rectangular sacrificial anode designed for OMC 50–140 HP and Johnson-Evinrude 50–225 HP marine engines (1987–1998), corresponding to OEM part numbers 393023 and 0436745. Available in zinc (00907), aluminium (00907AL) and magnesium (00907MG), all three versions measure 25 × 40 × 41 mm and feature an 8 mm mounting hole. The zinc version weighs 0.25 kg (0.55 lbs), the aluminium version 0.09 kg (0.20 lbs) and the magnesium version 0.06 kg (0.13 lbs). The anode provides sacrificial corrosion protection for compatible gearcase components.
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$ 20.56
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Gearcase Anode is a rectangular sacrificial anode designed for Johnson and Evinrude 250–300 HP outboard motors, corresponding to original OEM part number 397768. Available in zinc (00907BIS), aluminium (00907BISAL) and magnesium (00907BISMG), all three versions measure 25 × 40 × 40 mm and feature a 3/8" UNC threaded mounting hole. The zinc version weighs 0.25 kg (0.55 lbs), the aluminium version 0.09 kg (0.20 lbs) and the magnesium version 0.06 kg (0.13 lbs). The anode provides sacrificial corrosion protection for compatible outboard gearcase components.
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$ 23.72
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1-2 weeks delivery time The Tecnoseal 00908 is a zinc sacrificial halfmoon anode designed for Johnson-Evinrude 90–140 HP outboard motors, corresponding to original OEM part number 392123. It features a curved, crescent-shaped body measuring 116 mm in overall length, 77 mm in width and 23 mm in height, with a mounting hole spacing of 63 mm and two 6.5 mm diameter mounting holes. Weighing 0.82 kg (1.81 lbs), the anode provides sacrificial corrosion protection for compatible Johnson-Evinrude outboard components.
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$ 56.78
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Halfmoon Anode is a sacrificial anode designed for Johnson and Evinrude 50–75 HP outboard motors manufactured between 1983 and 2005, corresponding to original OEM part number 392462. Available in zinc (00909) and aluminium (00909AL), both versions feature a horseshoe-shaped body measuring 102 × 63 × 32 mm, with 74 mm mounting hole spacing and 7 mm mounting hole diameter. The zinc version weighs 0.71 kg (1.57 lbs), while the aluminium version weighs 0.28 kg (0.62 lbs). Both versions provide sacrificial corrosion protection for compatible outboard motor components.
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$ 51.10
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Transom Bracket Anode is a rectangular sacrificial anode designed for Johnson and Evinrude 160–280 HP V4–V6 outboard motors, corresponding to original OEM part numbers 398331 and 433458. Available in zinc (00910), aluminium (00910AL) and magnesium (00910MG), all three versions measure 23 × 43 × 58 mm and feature a stepped mounting hole with diameters of 16 mm and 8 mm. The zinc version weighs 0.33 kg (0.73 lbs), the aluminium version 0.13 kg (0.29 lbs) and the magnesium version 0.08 kg (0.18 lbs). The anode provides sacrificial corrosion protection for compatible outboard transom bracket components.
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$ 24.89
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Transom Bracket Anode is a rectangular sacrificial anode designed for Johnson and Evinrude outboard motors manufactured between 1987 and 2001, corresponding to original OEM part number 395780. Available in zinc (00911), aluminium (00911AL) and magnesium (00911MG), all three versions measure 45 × 23 × 31 mm and feature a stepped mounting bore with diameters of 14 mm and 8.5 mm. The zinc version weighs 0.19 kg (0.42 lbs), the aluminium version 0.072 kg (0.15 lbs) and the magnesium version 0.05 kg (0.11 lbs). The anode provides sacrificial corrosion protection for compatible outboard transom bracket components.
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$ 24.33
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Engine Plate Anode is a sacrificial anode designed for Johnson and Evinrude 2–150 HP outboard motors, corresponding to OEM part numbers 173029, 123009 and 327606. Also listed under Tecnoseal reference 01401, it is available in zinc (00912), aluminium (00912AL) and magnesium (00912MG). All versions have an oval plate design measuring 60 × 23 × 12 mm, with 25 mm mounting hole spacing and M5 threaded holes. The zinc version weighs 0.08 kg (0.18 lbs), the aluminium version 0.03 kg (0.07 lbs) and the magnesium version 0.02 kg (0.04 lbs).
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$ 15.39
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1-2 weeks delivery time The Tecnoseal 00913 is a zinc sacrificial transom bracket anode designed for Johnson and Evinrude 4–8 HP outboard motors manufactured between 1984 and 2005, corresponding to original OEM part numbers 432397 and 334451. It features a shaped, angled body with a mounting hole and overall dimensions of 30 mm (l), 12 mm (a), 37 mm (b) and 26 mm (h), according to the Tecnoseal drawing. The mounting hole diameter is 6.5 mm. Weighing 0.08 kg (0.18 lbs), the anode provides sacrificial corrosion protection for compatible outboard transom bracket components.
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$ 16.78
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1-2 weeks delivery time The Tecnoseal 00914 and 00914/1 are zinc sacrificial anode plates designed for the lower units of Johnson-Evinrude 20–35 HP outboard motors, corresponding to OEM part number 434029. Both versions feature paired, shaped plates measuring 49 × 41 mm, with a height dimension of 12 mm, an additional height (h1) of 6 mm and mounting diameters of 14 mm and 6 mm. The standard Tecnoseal 00914 weighs 0.18 kg (0.40 lbs), while the 00914/1 version is supplied as a pair with mounting hardware and weighs 0.20 kg (0.44 lbs). Both versions provide sacrificial corrosion protection for compatible outboard lower-unit components.
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$ 38.69
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1-2 weeks delivery time The Tecnoseal 00915 is a zinc sacrificial propeller shaft anode designed for Johnson-Evinrude 40–50 HP outboard motors manufactured between 1990 and 2005, corresponding to original OEM part number 398873. It features a circular body with a central opening and two mounting lugs, measuring 77 mm in overall length and 27 mm in height. The mounting hole spacing is 65 mm, with a central opening diameter of 26 mm and mounting hole diameter of 8 mm. Weighing 0.16 kg (0.35 lbs), the anode provides sacrificial corrosion protection for compatible outboard propeller shaft components.
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$ 28.13
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1-2 weeks delivery time The Tecnoseal 00916 is a zinc sacrificial gimbal plate anode designed for OMC Cobra 130–385 HP sterndrive systems, corresponding to original OEM part number 984547. It measures 110 mm in overall length, 95 mm in width and 30 mm in height, with an upper length (l1) of 85 mm and an additional height (h1) of 19 mm. The anode features two mounting holes spaced 56 mm apart, with specified diameters of 20 mm and 10.5 mm. Weighing 0.79 kg (1.74 lbs), it has a shaped rectangular body with recessed sections for installation on compatible OMC Cobra gimbal assemblies.
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$ 96.52
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Prop Shaft Housing Anode is a sacrificial anode designed for Johnson-Evinrude Diabolo 70–120 HP outboard motors, corresponding to original OEM part number 431708. Available in zinc (00917), aluminium (00917AL) and magnesium (00917MG), all three versions measure 75 × 50 × 22 mm and feature two mounting holes spaced 40 mm apart, with mounting diameters of 18 mm and 7 mm. The zinc version weighs 0.30 kg (0.66 lbs), the aluminium version 0.12 kg (0.26 lbs) and the magnesium version 0.08 kg (0.18 lbs). The anode features a shaped housing profile with a recessed mounting section for corrosion protection of compatible propeller shaft housing components.
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$ 58.15
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1-2 weeks delivery time The Tecnoseal Johnson-Evinrude Power Trim Anode is a sacrificial anode designed for the power trim systems of Johnson and Evinrude 60–300 HP outboard motors, corresponding to OEM part numbers 5007089 and 433580. Available in zinc (00918), aluminium (00918AL) and magnesium (00918MG), all three versions feature an elongated rectangular body measuring 172 mm in overall length, 21 mm in width and 34 mm in height, with an additional length dimension (l1) of 165 mm and 5/16" UNC mounting threads. The zinc version weighs 0.72 kg (1.59 lbs), the aluminium version 0.28 kg (0.62 lbs) and the magnesium version 0.18 kg (0.40 lbs).
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$ 49.74
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What do engine, sterndrive, and outboard anodes protect?
Engine, sterndrive, and outboard anodes provide sacrificial cathodic protection for submerged or water-exposed metal components. Depending on the installation, anodes may protect lower units, gear housings, trim tabs, transom brackets, propeller areas, cooling passages, and other metal parts that are exposed to galvanic corrosion.
The anode is designed to corrode preferentially, helping protect more valuable engine and drive components from deterioration.
Why is regular replacement of engine and drive anodes important?
Sacrificial anodes are gradually consumed while protecting the surrounding metal components, so they must be inspected and replaced before too much material is lost. A heavily worn or missing anode can no longer provide effective protection, increasing the risk of corrosion on the engine, sterndrive, or outboard assembly.
Inspection frequency depends on operating conditions, water type, vessel usage, and the electrical environment around the boat.
How can I choose the correct anode for an engine, sterndrive, or outboard motor?
The correct anode should match the engine or drive manufacturer, model, installation position, dimensions, mounting arrangement, and required anode material. OEM part numbers or cross-reference numbers are often the most reliable way to identify the correct replacement.
Because similar engines and sterndrives may use different anodes depending on model year or configuration, compatibility should always be checked before installation.