Description:

Two pound overboard magnesium anode with 15 ft. vinyl coated
galvanized steel cable and electrical connector for grounding.  This
Grouper features Mil-Spec magnesium alloy to offer the highest level
of corrosion protection for a freshwater vessel while at the dock.  
Simply attach to the vessel’s DC ground or metal hull and hang
overboard.  It’s a very effective solution for corrosion protection of
freshwater vessels, especially those with aluminum hulls, pontoons or
outdrives.  

Specifications:
 Weight:  2 lbs nominal, 1.8 lbs min.

Solving A Common Dilemma:

Q)    I dock my boat in freshwater but plan to spend some time with it this summer on the ocean.  Which anodes should I use, magnesium or aluminum?

A)   Never use magnesium anodes on outdrives that will operate in saltwater.  They are too strong and can peel paint and damage the metal housing of the outdrive.  Instead, install aluminum anodes on your outdrive for the season, and when at your freshwater dock suspend a magnesium Grouper anode overboard within a couple feet of the outdrive(s).  This provides the corrosion protection benefits of both types of anodes.