Tecnoseal "Tecnoseal X8 Shaft Anode - Zinc - 1-3/4 Shaft Diameter, X8"

"Tecnoseal X8 Shaft Anode - Zinc - 1-3/4 Shaft Diameter, X8. These Boating & Marine from Tecnoseal protect propeller shafts and rudders from the inside out by binding nitrogen gas to the anode which prevents the formation of zinc salts which would otherwise cause pitting and corrosion.