MG Duff CM43994M magnesium button anode for Mercury MerCruiser applications, providing sacrificial corrosion protection optimized for freshwater use.

• Part number: CM43994M
• Material: Magnesium — suited to freshwater environments
• Fits: Mercury/MerCruiser button-type anode locations
• Protects: sacrificial protection for lower units, gearcases and prop shafts
• Installation: button-style replacement; fits existing retaining hardware
• Supply: single anode
• Manufacturer: MG Duff
• OEM reference: Mercury 43994
• Compatibility: check your engine model and lower unit; fits many Mercury/MerCruiser models — see Mercury/MerCruiser anodes collection
• Dimensions & fastener: verify OEM button diameter, thickness and retaining fastener size before ordering
• Not for brackish or saltwater use: magnesium anodes are intended for freshwater only; use zinc or aluminum alternatives in brackish/saltwater

Check compatibility with your engine model and lower unit diagram before ordering to ensure correct fit.