Tecnoseal X15 Shaft Anode - Zinc - 3-1/2" Shaft Diameter

The Tecnoseal X15 Shaft Anode in zinc is a critical cathodic protection component designed for marine and freshwater propulsion systems. This 3-1/2" shaft diameter anode sacrifices itself to prevent corrosion and electrolysis damage to underwater metal components, including propellers, shafts, and hull fittings. Shaft anodes are essential maintenance items for any vessel operator who wants to protect expensive drivetrain components from saltwater and brackish water degradation.

Constructed from high-purity zinc, the Tecnoseal X15 features a 5.118" outer diameter and 3.75" height, with a precisely machined 3.50" inner bore to slip fit securely over your vessel's propeller shaft. The anode includes four mounting holes for positive mechanical attachment, ensuring stable positioning and optimal galvanic protection. Zinc anodes work by corroding preferentially to steel and bronze components—the zinc oxidizes first, creating a protective barrier that prevents rust, pitting, and structural failure on critical drivetrain parts.

This anode is ideal for inboard engines, sterndrive units, and sailboat propulsion shafts operating in salt water, brackish water, or highly mineralized freshwater environments. Proper installation requires secure fastening to prevent shaft rotation, and the anode should be inspected annually and replaced when eroded by 50% or more. The 7.1 lb weight ensures substantial galvanic capacity for extended protection intervals, making the Tecnoseal X15 a cost-effective insurance policy against catastrophic corrosion damage that can strand your vessel or require expensive shaft and coupling replacement.