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Sierra 118-6202A Aluminum Trim Tab Anode for Mercury Outboards

Manufacturer

Sierra

<h3>Sierra: Six Decades of Marine Aftermarket Excellence</h3><p><strong>Sierra</strong> has spent nearly 60 years earning its reputation as one of the most trusted names in the marine aftermarket industry. Originally focused on engine and drive components for boats, the brand has grown into a comprehensive source for nearly everything a boater needs to keep their vessel running at its best — from precision instrumentation to complete engine rebuild hardware.</p><p>Now operating as a brand of Dometic, Sierra manages global aftermarket distribution from a 300,000 sq. ft. facility in Litchfield, Illinois. The Sierra brand today encompasses not only its flagship marine parts line but also well-established marine names like Shields and Moeller, offering boaters a broader catalog than ever before. Whether you own an outboard, inboard, or sterndrive, Sierra's engineering team designs products to meet or exceed OEM specifications.</p><h3>Precision Instrumentation You Can Trust on the Water</h3><p>One of Sierra's most recognized product areas is its marine instrumentation lineup. The brand's <a href="/7570-sierra-gauge-set-1480">gauge sets</a> cover everything from classic analog instrument clusters to advanced digital multi-function displays. Sierra offers packages suited to outboards, sterndrives, and gasoline-powered inboards, with options ranging from coordinated analog kits in styles like Arctic, Eclipse, and Amega to modern touchscreen solutions like the R3 multi-function gauge. Features such as scratch-resistant domed glass lenses, silicone-dampened pointers, and perimeter backlighting make these instruments highly readable in all conditions.</p><p>Behind every accurate gauge reading is a properly calibrated sending circuit. Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> are a critical part of that chain, ensuring the signals from sensors and sending units are correctly interpreted by your instruments. These components are built to marine-grade standards to resist moisture, vibration, and corrosion — the realities of life on the water.</p><h3>Engine Internals Built to OEM Standards</h3><p>Sierra's history in marine power is perhaps best demonstrated by its deep catalog of engine components. The brand's <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> cover a wide range of outboard and inboard applications and are engineered to deliver reliable seals in the demanding thermal and chemical environment of a marine engine. For boaters performing seasonal overhauls, top-end rebuilds, or full engine restorations, Sierra gasket kits are a go-to resource trusted by professional marine technicians and DIY boaters alike.</p><h3>A Complete Marine Parts Partner</h3><p>Beyond instrumentation and engine internals, Sierra's catalog spans fuel systems, electrical supplies, steering components, shore power, and more — all covered by what the brand calls an industry-leading warranty. Sierra also maintains a comprehensive parts-finder tool that enables cross-referencing with OEM part numbers from major manufacturers including Mercury, Yamaha, Suzuki, Volvo Penta, and others, making it straightforward to find the right replacement part for virtually any application.</p>

Part Number

118-6202A
09/11/2036 3:05 PM
Sale Price

$101.90

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Sierra 118-6202A is a replacement aluminum trim tab anode engineered to protect your outboard motor from galvanic corrosion. Mounted to the anti-ventilation plate of the lower unit, this sacrificial anode corrodes preferentially, shielding metal engine and drive components from the electrochemical deterioration caused by dissimilar metals submerged in water.

Why Aluminum?

Aluminum anodes are the recommended choice for brackish water environments or for boats that operate in both fresh and salt water. Unlike zinc anodes, which are optimized strictly for salt water, aluminum alloy anodes provide reliable sacrificial protection across a broader range of water conditions.

Key Features:

  • Constructed from high-grade aluminum alloy for maximum sacrificial protection in brackish or mixed-use water environments
  • Designed to meet or exceed OEM specifications for a proper fit and reliable performance
  • Functions as the primary sacrificial anode on the gearcase anti-ventilation plate, protecting lower unit hardware from galvanic corrosion
  • Direct replacement for Mercury outboard trim tab anodes — OEM cross-reference: GLM 29570
  • Part of Sierra's comprehensive corrosion protection line for Mercury and Mariner outboard engines

Sierra is a trusted name in aftermarket marine parts with decades of experience supplying the marine industry. Replace your trim tab anode regularly — at minimum once per season for boats kept in the water — to ensure your lower unit hardware remains protected.

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Fast Service

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