Tecnoseal TEC-20 Teardrop Anode - Zinc

The Tecnoseal TEC-20 Teardrop Anode is a zinc sacrificial anode engineered to protect your boat's hull from galvanic corrosion—one of the most destructive forces below the waterline. After years running saltwater, freshwater, and brackish environments, any serious boater knows that corrosion eats through metal components silently and relentlessly. This teardrop-shaped zinc anode mounts directly to your hull, acting as a expendable barrier that corrodes instead of your propeller shaft, rudder hardware, and through-hull fittings, extending their service life by years.

Constructed from high-purity zinc, the TEC-20 delivers consistent electrochemical protection through galvanic displacement—the zinc's lower electrical potential causes it to oxidize preferentially, shielding more valuable steel and bronze components from the same fate. The compact teardrop profile (3.35" length × 1.81" width × 0.55" height) minimizes drag while maximizing surface area for cathodic protection. Weighing just 0.4 lbs, it mounts cleanly to hull transducers, through-hull fittings, or external brackets without affecting performance or trim. Unlike paint or epoxy coatings, sacrificial anodes work continuously and require no maintenance—they simply wear down over time as designed, protecting everything downstream.

This anode suits any vessel operating in salt water, brackish harbors, or heavily mineralized freshwater lakes where galvanic corrosion accelerates. Replacement intervals depend on water chemistry and usage—checking your anode annually is best practice, especially for boats in service year-round. The TEC-20 pairs seamlessly with Tecnoseal's ecosystem of through-hull fittings and bonding systems, ensuring comprehensive corrosion defense across your entire metallic infrastructure. Whether you trailer in a corrosive estuary, anchor year-round, or fish competitive waters, installing or refreshing sacrificial anodes every season is the difference between a boat that holds value and one that hemorrhages money to hidden rust.