Protection from corrosion in saltwater, brackish water and freshwater.Manufactured to OEM and MIL-SPEC specifications. Rigorously tested to ensure consistent quality. Provides cathodic protection of ocean-going vessels, structures and equipment constructed of iron, steel and aluminum.Key FeaturesPrevents galvanic corrosionManufactured to OEM and MIL-SPEC specificationsUses mil-spec mil-a-l800l alloyPressure die-cast anodesNOTEAttachment method indicated as follows: B=Bolts on. W=Welds on. WI=Wires on.Zinc Alloy Anodes: Salt water onlyAluminum Alloy Anodes: Salt, Fresh or Brackish waterMagnesium Alloy Anodes: Fresh water only