Zinc Streamline Shaft Anode - Shaft Diameter 3-1/2"

Streamline Collars are the anode of choice for propeller shaft protection as the football shape minimizes turbulence and drag.
These anodes feature precise internal sizing for maximal contact with the shaft for best protection.
All Sea Shield zinc anodes conform to Mil Spec MIL-A-18001 for maximum protection.

• Designed by divers, for divers
• Captive Allen Head fasteners for easiest underwater installation - no slot for the driver to slip out of
• Threads are tapped into the anode for super easy installation - no cross-threading, no galling
• Lock washers prevent loosening under vibration
• Made in California, USA

When should I replace my zinc anode?

Regularly inspect the metal that is protected. Increase the surface area if there are signs of corrosion, even with the presence of zinc. Replace the zinc when around half of the anode has corroded. It is preferable for this replacement to happen no more than once a year.

Which is better aluminum or zinc anodes?

Aluminum anodes offer a lighter, more cost-effective, and environmentally friendly option but require frequent cleaning to prevent passivation. On the other hand, zinc anodes are heavier, pricier, and more toxic, yet they are more dependable in saltwater.