Tecnoseal X7AL Shaft Anode - Aluminum - 1-1/2" Shaft Diameter

The Tecnoseal X7AL Shaft Anode is a marine-grade cathodic protection component engineered to shield propeller shafts and related through-hull fittings from galvanic corrosion. Designed for boat owners and marine maintenance professionals, this aluminum anode sacrifices itself electrochemically to prevent rust and structural degradation on underwater metallic components. It is an essential consumable for any vessel operating in saltwater or brackish environments where corrosion protection is non-negotiable.

Manufactured from pure aluminum, the Tecnoseal X7AL features a precisely machined inner diameter of 1.50 inches to fit standard shaft sizes, with an outer diameter of 2.58 inches and a height of 2.62 inches. The anode includes four mounting holes for secure installation and weighs 0.54 pounds, making it lightweight yet durable for extended underwater service. Aluminum anodes are selected over other materials because they provide superior electrochemical potential, dissolving preferentially to protect steel and bronze hull fittings—a proven passive defense mechanism used across commercial and recreational maritime vessels.

This shaft anode is ideal for inboard engines, outdrives, and through-hull applications on sailboats, motorboats, and larger vessels that encounter regular saltwater exposure. Installation is straightforward—the anode slides over the shaft and is secured using the four mounting holes to a shaft log or cutless bearing housing. Regular inspection and replacement every 2–4 years (depending on water salinity and usage) ensures continuous corrosion protection. The Tecnoseal X7AL is a cost-effective preventative maintenance solution that extends the service life of expensive marine hardware and avoids costly repairs caused by unchecked galvanic corrosion.