Tecnoseal Trim Cylinder Anode - Magnesium - Alpha

The Tecnoseal Trim Cylinder Anode – Magnesium – Alpha is a critical sacrificial protection component designed for marine outboard and sterndrive cooling systems. As a mechanic familiar with saltwater corrosion challenges, you know that trim cylinders are vulnerable to galvanic attack, especially in brackish or ocean environments. This magnesium anode collar serves as the first line of defense, corroding preferentially to protect aluminum and steel trim cylinder housings from destructive rust and pitting that would otherwise compromise structural integrity and smooth operation.

Manufactured by Tecnoseal, this trim cylinder anode leverages magnesium's electrochemical properties to attract corrosive ions away from the cylinder assembly itself. The compact collar design—measuring 2 × 1 × 2 inches and weighing just 0.1 pounds—fits around the trim cylinder housing without adding bulk or interfering with tilt-trim mechanism operation. Magnesium anodes are ideal for freshwater and light brackish applications, offering faster corrosion rates than zinc and superior protection in softer water where conductivity is lower. The engineered geometry ensures maximum surface contact with the surrounding medium for consistent, long-lasting galvanic protection.

This anode is compatible with Alpha sterndrive trim cylinder assemblies and should be inspected and replaced annually during routine spring maintenance, especially if your vessel operates in freshwater lakes, rivers, or mixed-salinity environments. Proper anode maintenance prevents costly cylinder replacement and ensures reliable tilt-and-trim performance season after season. For maximum corrosion control, pair this trim cylinder anode with other sacrificial anodes on your lower unit and skeg to create a comprehensive cathodic protection system.