Mercury – Quicksilver Aluminum Square Anode Set | Corrosion Protection Kit | Cast Aluminum | 42121Q02

Overview

Corrosion can sneak up fast in any water, and the Mercury Marine 42121Q02 Quicksilver Aluminum Square Anode Set helps stop it before it starts. This set of two anodes is designed for a range of Mercury, Mariner, and Force outboards, including popular 6–15HP models. Made from mil-spec cast aluminum, these anodes protect your gearcase and other underwater metals from galvanic corrosion in both fresh and saltwater. Each kit comes with new hardware, making replacement quick and easy — a small job that pays off in long-term protection for your engine.

Key Features

• Purpose: Prevents galvanic corrosion on underwater metal components.
• Material: Made from cast aluminum, meeting MIL-A-24779(SH) military standards.
• Performance: Works in freshwater, saltwater, and brackish environments.
• Design: Includes two square anodes and mounting hardware for quick installation.
• Durability: Lasts longer and reacts faster than traditional zinc anodes.
• Compatibility: Fits a wide range of Mercury, Mariner, and Force 6–15HP outboards.

Engine & Boat Compatibility

• 1998 Force 6.9HP and 15HP outboards with standard gearcase.
• 1986 and newer Mercury/Mariner 6–9.9HP TwoStroke models.
• 1995–2004 F8 and F9.9 FourStroke, 2001+ F13.5HP, and 1998–2006 F15HP FourStroke outboards.
• Mercury XR10, 10HP Marathon, SeaPro, and Viking models.
• Commonly used on small fishing boats, inflatables, and portable runabouts.

Performance & Real-World Benefits

The 42121Q02 anode set sacrifices itself to corrosion, protecting the aluminum and stainless parts of your outboard — the gearcase, propeller shaft, and mounting hardware — from electrolysis. These aluminum anodes perform better than zinc in both salt and freshwater, offering broader protection and a longer lifespan.

Replacing worn anodes regularly is one of the easiest ways to extend your motor’s life. With this kit, installation takes just a few minutes — simply bolt on the new anodes and your engine is protected again.

Why Choose Mercury OEM

The Quicksilver 42121Q02 is a genuine Mercury Marine part, cast from high-quality aluminum designed specifically for Mercury and Mariner gearcases. Aftermarket anodes can vary in alloy composition, which means they might corrode unevenly or fail to protect key areas.

Mercury’s OEM anodes are tested to exact military specifications for predictable, uniform corrosion and long-term performance. They’re the right match for your outboard — precise, proven, and made to last.

FAQ

Q1: What engines does this set fit?
It fits Mercury, Mariner, and Force 6–15HP outboards, including models listed above.

Q2: How many anodes are included?
The kit includes two aluminum anodes plus installation hardware.

Q3: Can these be used in saltwater?
Yes — aluminum anodes are effective in both fresh and saltwater, unlike zinc, which performs best only in saltwater.

Q4: How often should I replace them?
Inspect them every few months and replace when they’re about halfway corroded.

Q5: Why OEM instead of aftermarket?
Mercury’s OEM anodes meet exact alloy and fit standards, ensuring complete corrosion protection for your outboard.