Fastjeff wrote:I used Boat Zinc on mine and they needed replacement every two years (in brackish water). That means they were working, right?
That is why they are called "sacrificial" anodes. Better to have them get eaten up or dissolved than the boat.
I put new shaft anodes on every year. It is hard to find the aluminum ones. Different brand names for the aluminum anodes but they are all the same alloy. Best place to go is boatZincs.com You could call them up and tell them you have Marinette, what size it is and they will know exactly what you need, and have the best price.
If you are shopping for Globe Drivesavers, be sure to shop around. Prices vary wildly by who sells them. All made by the same company. Found some companies marking the price up 3 or 4 times the cheaper places. Easy to save $600 to $800 if you shop around.--Ed