Tecnoseal X16 Shaft Anode - Zinc - 3-3/4" Shaft Diameter

The Tecnoseal X16 Shaft Anode in zinc is a critical cathodic protection component designed for marine propulsion systems and saltwater applications. This shaft anode sacrifices itself to protect your vessel's metal propeller shaft, strut, and other underwater hardware from corrosion and galvanic degradation. Marine operators, boat owners, and commercial fishing vessels rely on quality shaft anodes to extend equipment life and prevent costly replacement of primary structural components in harsh saltwater environments.

Constructed from pure zinc, the Tecnoseal X16 features a 3.75-inch inner diameter bore that accommodates standard shaft sizes, with an outer diameter of 5.59 inches and a compact 3.75-inch height for efficient installation. The anode design includes four mounting holes for secure fastening to the shaft, ensuring positive contact and reliable electrochemical protection. Zinc anodes are the industry standard for saltwater service due to their optimal electrochemical potential, corrosion rate, and cost-effectiveness compared to aluminum or magnesium alternatives in marine environments.

This 9.1-pound anode is ideal for inboard and outboard propulsion systems, particularly those operating in seawater or brackish conditions where corrosion risk is highest. Routine inspection and replacement of shaft anodes—typically every 2–3 years depending on water salinity and operating hours—ensures your propeller shaft remains protected against pitting, erosion, and structural failure. The Tecnoseal X16 is a direct replacement component compatible with most recreational and commercial marine propulsion shafts in the 3.75-inch diameter class, making it an essential maintenance item for any saltwater vessel.