Tecnoseal X13 Shaft Anode - Zinc - 3" Shaft Diameter

The Tecnoseal X13 Shaft Anode is a zinc-based cathodic protection device engineered for marine and freshwater propeller shaft systems with a 3" inner diameter. This shaft anode prevents electrolytic corrosion and galvanic attack on underwater metal components, protecting your vessel's drive train from rust and structural degradation. Designed for boat owners, marinas, and commercial marine operators, this anode sacrifices itself to shield more valuable shaft materials—a proven, cost-effective maintenance solution for extending equipment lifespan in saltwater and brackish environments.

Constructed from high-purity zinc alloy, the X13 anode features a 4.80" outer diameter and 3.77" height, with four mounting holes for secure fastening to your shaft tube or strut assembly. Zinc's electrochemical properties make it more reactive than steel and bronze, ensuring it oxidizes preferentially and protects the steel shaft beneath. Weighing 6.1 lbs, this compact anode integrates seamlessly into standard marine drive systems without adding significant drag or vibration, while its solid cast construction guarantees durability across multiple seasons of harsh saltwater immersion.

This anode is ideal for inboard and outboard propulsion systems, sailboats, powerboats, and any vessel operating in corrosive marine environments where unprotected shafts face rapid deterioration. Installation requires removal of the existing anode (if present) and positioning around the shaft tube, securing it with stainless steel fasteners through the four drilled holes. Replace the Tecnoseal X13 annually or when visibly eroded by approximately 50%, depending on water salinity and vessel usage—regular replacement is essential to maintain optimal cathodic protection and prevent costly shaft repairs or replacement.