Mercury – Quicksilver Zinc Trim Tab | Corrosion Protection & Steering Aid | Cast Zinc | 34127T2

Overview

Steering control and corrosion protection go hand in hand with the Mercury Marine 34127T2 Quicksilver Zinc Trim Tab. Designed for MerCruiser R, MR, and Alpha One sterndrives, this trim tab helps offset propeller torque for smoother handling while protecting your drive from galvanic corrosion. Made from high-quality zinc, it’s built for both fresh and saltwater use, providing reliable protection and balance season after season. Simple to install and easy to inspect, it’s one of those small components that quietly keep your boat performing its best.

Key Features

• Purpose: Reduces steering torque and protects the drive from galvanic corrosion.
• Material: Made from marine-grade cast zinc, ideal for saltwater and freshwater use.
• Design: Hydrodynamic shape balances steering and helps maintain smooth tracking.
• Compatibility: Fits MerCruiser R, MR, and Alpha One series sterndrives.
• Maintenance: Inspect and replace periodically for optimal corrosion protection.
• Note: Not recommended for use with high rake propellers.

Engine & Boat Compatibility

• Compatible with MerCruiser R, MR, and Alpha One sterndrive models.
• Suitable for freshwater and saltwater boating conditions.
• Commonly used on runabouts, fishing boats, and cruisers powered by MerCruiser drives.
• Designed for drives using standard steering and propeller setups (non-high rake).

Performance & Practical Benefits

The 34127T2 trim tab performs two essential jobs: it offsets prop torque to improve steering and it protects your lower unit from galvanic corrosion. The zinc alloy acts as a sacrificial metal, corroding before your sterndrive’s aluminum casing does — saving you from costly repairs.

At the same time, the tab’s hydrodynamic design adds just the right amount of counterforce to your steering system, making the wheel lighter and the ride smoother. Once installed, it quietly does its job every trip out — no adjustments, just reliable protection and balance.

Why Buy OEM

Mercury’s Quicksilver 34127T2 is a genuine OEM part, built to meet the exact specs of your MerCruiser sterndrive. Aftermarket anodes and tabs often use inconsistent zinc alloys that wear unevenly or fail to provide proper protection.

OEM trim tabs are tested for material purity, corrosion rate, and fit, ensuring dependable performance in real-world marine conditions. With Mercury, you know you’re getting the right composition, the right fit, and protection that lasts.

FAQ

Q1: Which drives does this trim tab fit?
It’s made for MerCruiser R, MR, and Alpha One sterndrives.

Q2: What’s it made of?
It’s made of cast zinc, ideal for use in both saltwater and freshwater.

Q3: What does the trim tab do?
It offsets steering torque and serves as a sacrificial anode to protect against galvanic corrosion.

Q4: How often should I replace it?
Inspect it several times a season and replace it when pitting or corrosion covers about half its surface.

Q5: Why OEM over aftermarket?
Mercury OEM parts guarantee correct alloy composition, fit, and performance tested under marine conditions.