00045A for Mercruiser Alpha 1 Gimbal Housing Block — Replaces Mercury 821631Q1

Protect your Mercruiser outdrive with a precision-fit aluminum gimbal housing block anode engineered to meet OEM requirements and deliver reliable corrosion protection in salt, brackish, or fresh water. Made in the USA for dependable performance and durability.

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Contents

This product includes all required aluminum anodes and mounting hardware for a full replacement:

● 00045A — Qty 1 (Replaces 821631Q1)

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Key Benefits

● Aluminum anode for gimbal housing corrosion protection

● OEM-equivalent replacement for Mercury part #821631Q1

● Aluminum alloy approved for use in all water types

● Manufactured in the USA to MIL-DTL-24779 military specification

● Meets Mercury factory requirements — won’t invalidate warranty

● Longer-lasting and more effective than traditional zinc anodes

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Compatibility

Fits:

● Mercruiser Alpha 1 Gen I outdrives

● Mercruiser Alpha 1 Gen II outdrives

Replaces OEM:

● Mercury 821631Q1

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Why Aluminum Anodes?

Mercury and Mercruiser outdrives are factory-equipped with aluminum anodes because they provide reliable protection across salt, brackish, and freshwater environments. Unlike zinc, which can become inactive in freshwater, aluminum continues to perform. Using zinc anodes on Mercury or Mercruiser drives may also void your manufacturer warranty, making aluminum the correct and compliant choice.

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Product Specifications

● Material: Navalloy® Aluminum Alloy

● Water Type: Salt, Brackish, Fresh

● Manufacturing Standard: MIL-DTL-24779

● Total Weight: 0.7 lbs (0.3 kg)

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What’s Included

● Complete aluminum anode

● All required mounting hardware

● Installation instructions

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Ideal For

● Mercruiser Alpha 1 Gen I & Gen II owners

● Routine corrosion prevention and maintenance

● Mixed-water boating environments

● DIY replacement or professional service