there not steel are they sacrificial anodes ? if so i have been told to replace one both drives to steel for fresh water trailer boats ane idea's

Not sure what Merc thoughts were on that one, I have found more then a few that rotted the studs off. Swapped them to stainless never had one go bad.

Phil

thanks phil s.s. it will be

I just replaced mine they are aluminum and the caps that screw on them are zinc.